Chris Bumstead Rear Delt Workout: Complete the 3D Shoulder Look
UPLIFT IRON CLUBWhy Rear Delts Complete the 3D Shoulder Look
Chris Bumstead’s shoulders are usually discussed from the front: wide clavicles, round side delts and a frame that makes his waist look smaller. But the “3D” effect is finished from behind. The posterior deltoid adds thickness to the back edge of the shoulder, creates a cleaner transition into the upper arm and helps the shoulder look round instead of flat when you turn sideways. That is why rear-delt work has repeatedly appeared in Bumstead’s training, not as a token finisher but as a recurring priority.
He has been unusually explicit about that point. In an early Muscle & Fitness interview, Bumstead said he would start and finish some shoulder sessions with rear-delt work to even out the shape of his delts. Years later, public shoulder sessions still showed the same pattern: cable rear-delt flyes, reverse pec-deck work and rear-delt raises kept appearing even as the rest of his exercise selection changed. The useful lesson is not that one exact CBum routine is sacred. It is that a physique weakness deserves deliberate volume and repeatable movements.
Rear delts also sit in a crowded neighborhood. Rows, pulldowns and other back work involve them, but those movements can be dominated by the lats, rhomboids and traps. Pressing, meanwhile, already gives the front delts plenty of work. If your shoulders look thick from the front but disappear from a rear three-quarter angle, more pressing is unlikely to solve the problem. Direct horizontal-abduction work gives the posterior head a clearer job.
For most lifters, two direct rear-delt movements in a shoulder or pull session are enough. Pick one stable option you can load and one cable or dumbbell variation that lets you feel the target muscle. The goal is not to annihilate a tiny muscle with circus volume. It is to accumulate clean reps, progress them and make the back of the shoulder impossible to ignore.
Reverse Pec Deck: The Stable Rear-Delt Builder
The reverse pec deck is the obvious anchor for a rear-delt-focused session because stability removes excuses. Face the pad, set the seat so the handles sit around shoulder height, keep a soft bend in the elbows and sweep the upper arms out and back. Bumstead has used the movement at the end of shoulder sessions, including a documented off-season workout in which he paired cable rear-delt work with reverse pec-deck flyes for four total rear-delt sets.
The biggest technical mistake is turning the fly into a mid-back squeeze. If you aggressively pinch the shoulder blades together and keep chasing more range, the rhomboids and middle traps can take over. Think about moving the upper arms wide rather than trying to make the handles travel as far behind you as possible. Keep the chest connected to the pad and stop when the rear delts are shortened without your torso shifting.
Use a load that lets every repetition look similar. A practical target is 3–4 sets of 12–20 reps with roughly one to three reps left in reserve on the early sets. The final set can go closer to technical failure if the machine feels comfortable. When the reps become jerky, the elbows start bending dramatically or the chest leaves the pad, the set is done even if the stack could still move.
Progression is deliberately boring. First add controlled reps inside the range. Once you can hit the top of the range with the same seat setting, tempo and range of motion, add the smallest available load and build back up. That makes the reverse pec deck useful for months rather than just one pump-heavy workout. It is also a good choice after pressing because the machine asks very little from the lower back or core, letting you train the rear delts hard when the rest of the session has already created fatigue.
Cable Rear-Delt Fly: Keep Tension Where You Want It
Cables complement the pec deck because they let you change the line of pull without losing tension between repetitions. Bumstead has repeatedly used single-arm and cross-body rear-delt cable flyes, sometimes early in the session as a warm-up and sometimes late as direct hypertrophy work. In one documented shoulder session, he opened with single-arm cable rear-delt flyes because the movement helped him prepare a shoulder that had been bothering him. That context matters: the exercise was useful because it fit his body and training phase, not because cables possess some secret champion-only property.
Set the pulley around shoulder height or slightly above, then grab the opposite cable so the arm starts across the body. Keep the ribcage stacked and let the shoulder blade move naturally rather than locking it violently back. Sweep the upper arm out in a wide arc until it is roughly in line with the torso. The hand is just a hook; the elbow and upper arm should define the path.
Start lighter than your ego wants. Try 3 sets of 12–20 reps per side with a controlled two-second return. If you have to rotate the torso, yank the handle or turn the movement into a row, reduce the load. A one-arm version can be especially useful because you can brace the free hand against the machine and focus on one posterior delt at a time.
Cables also make small adjustments easy. If a perfectly horizontal path feels awkward, move the pulley or arm path a few centimeters until the rear delt takes the load without a pinchy sensation. That is more productive than forcing a textbook angle that does not suit your shoulder. The key is repeatability: same setup, same arc, same control, then gradual progression. That is much closer to the logic behind Bumstead’s rear-delt training than chasing a new variation every week.
Dumbbell Rear-Delt Raises: Simple, Brutal and Easy to Cheat
Dumbbell rear-delt raises look almost too simple, which is exactly why they are easy to ruin. Bumstead has used bent-over and seated rear-delt raise variations as high-rep finishers. The movement works well when you can create a stable hinge or chest-supported position and keep the rear delts moving the arms. It works poorly when the rep becomes a shrug, a row and a lower-back endurance test all at once.
For a bent-over version, hinge until the torso is close to parallel with the floor, soften the knees and keep the neck neutral. Let the dumbbells hang under the shoulders, then raise the arms out and slightly back with a modest elbow bend. Do not chase height. If getting the dumbbells higher requires you to retract the shoulder blades hard or swing the torso, the useful rear-delt range has already ended.
A chest-supported incline-bench version is even cleaner. Set a low incline, lie face-down and perform the same wide fly. The bench removes much of the temptation to use momentum and makes fatigue easier to judge. Two or three sets of 15–25 controlled reps can be plenty after cable or machine work. Rear delts do not need enormous dumbbells to receive a hard stimulus.
There is also no prize for making every rear-delt exercise mechanically identical. The pec deck gives stability, the cable gives continuous tension and adjustable lines, and the dumbbell gives a simple free-weight challenge that becomes hardest near the top. Those differences are useful. A sensible session can use one main movement for measurable progression and one higher-rep variation for extra volume. If your traps are burning while the back of the shoulder feels absent, change the setup or reduce the load before adding more sets.
How to Program Rear Delts Without Wrecking Shoulder Day
The rear delts can tolerate frequent work, but “more” still has to earn its place. Bumstead’s public training has ranged from very high-volume shoulder work earlier in his career to more controlled, joint-conscious sessions later on. That evolution is useful for ordinary lifters: the best volume is the amount you can recover from while your reps, loads and execution improve.
Start by counting what your week already contains. Heavy rows and other pulling movements provide indirect posterior-shoulder work, while direct flyes add a more specific stimulus. A practical starting point is 6–10 direct rear-delt sets per week, split across one or two sessions. For example, perform 3 sets of cable rear-delt flyes on a pull day and 3–4 sets of reverse pec deck on shoulder day. If performance is climbing and soreness resolves normally, keep that structure for six to eight weeks before deciding you need more.
Place rear delts according to priority. If they are a glaring weak point, training them first with a light cable variation can improve focus before heavier pressing or pulling. If your main goal is overhead-press strength, put the demanding press first and save rear-delt isolation for later. Bumstead has used both approaches at different times, which is a reminder that exercise order should serve the current goal rather than become a ritual.
Keep most isolation work in moderate-to-high rep ranges—roughly 10–25 reps—and stop sets when the target-muscle mechanics disappear. You can use a final drop set or partials occasionally, but those techniques should add stimulus rather than disguise poor loading. Leave at least a day between hard shoulder sessions when possible, and pay attention to how rear-delt work interacts with back training.
Persistent sharp pain, weakness or loss of motion is not a hypertrophy problem to solve with more rear-delt sets. Change the exercise and get appropriate professional assessment if symptoms continue. The bodybuilding goal is a shoulder you can keep training, not one heroic session that forces a week off.
The Complete Rear-Delt Workout for a Rounder Classic-Physique Shoulder
Put the pieces together and the workout is straightforward. Begin with 2 light sets of single-arm cable rear-delt flyes for 15–20 reps per side, using them to establish the movement rather than chase fatigue. Move to the reverse pec deck for 3 hard sets of 12–20 reps. Finish with 2–3 sets of chest-supported dumbbell rear-delt raises for 15–25 reps. That gives you seven to eight direct sets—enough to matter without turning a small muscle into an entire training day.
If you are already doing a full shoulder session, keep the rear-delt block shorter. A press, lateral raise and then 3 sets each of reverse pec deck and cable rear-delt flyes covers the major visual jobs: front-delt thickness from pressing, width from the lateral head and posterior roundness from direct rear-delt work. If you train back the next day, reduce the rear-delt volume rather than carrying unnecessary fatigue into rows and pulldowns.
Progress the workout with three markers. First, can you keep the intended muscle doing the work? Second, can you add reps without shortening the range or adding momentum? Third, can you eventually add a small amount of load while preserving both? Take occasional rear and side photos under similar lighting. Rear delts are a visual muscle, and a logbook alone cannot tell you whether the shoulder is becoming more balanced.
Bumstead’s stage poses show why the detail matters. From the rear, the delts have to connect a wide upper back to the arms without leaving a flat edge. From the side, the posterior head helps complete the round cap instead of letting all the visual mass sit in front. You do not need his genetics, professional schedule or contest-level volume to borrow that principle.
Train the rear delts like a real body part: give them a stable movement, a cable line you can control, enough weekly volume to progress and months of repetition. The result is not just a stronger reverse fly. It is a shoulder that looks finished from every angle—the actual meaning of the 3D look.
Bodybuilding shirts, tanks and gym gear for lifters chasing muscle, size, symmetry and the pump.
EXPLORE COLLECTION
