How I Blew Up My Shoulders

Jeff has coached many clients who intuitively let the traps dominate lateral raises. He tested this cue with several gym-goers, comparing a neutral instruction ('just get the weight up') to the shovel cue. Every person reported a stronger side-delt burn and found the set harder with the shovel cue, confirming subjective improvement. He frames this as a way to better isolate the delts without worrying about perfect form—just a mental image. The cue is particularly useful for women who often express concern about building oversized traps, as it tilts the stimulation toward the deltoid.

Jeff shares a poll showing most viewers train shoulders twice a week (or less). He argues that cramming 12 sets into one day, for example, wastes sets beyond the effective cap. His recommendation: perform lateral raises or rear-delt flies after every workout (5 days a week was his own past approach) or follow a split like his Men Max program template. He acknowledges the advice is anecdotal from coaching, but points out delts almost never get sore and recover within 24-48 hours. The key is to use isolation exercises that don't tax the central nervous system heavily.

Jeff pushes back on the idea that vertical pressing is unnecessary because front delts get enough work from bench presses. His EMG data showed more side than front delt activation on a machine press. He challenges viewers to commit to a full year of dedicated heavy pressing, promising significant shoulder mass gains. The approach couples simple linear progression with periodic deloads to manage fatigue. He uses a machine himself for safety and consistent overload.

Jeff demonstrates with his own before/after: at 20% body fat his shoulders lacked the 3D pop; at 9% they appeared significantly broader and rounder. He states this single change has the biggest impact on shoulder aesthetics. He uses his MacroFactor app to structure his cut, but the principle is universal. He acknowledges many people will skip this tip because it involves diet, but insists no training trick can rival the visual transformation of getting lean.

Jeff first educates on muscle length: the deltoid is short in the contracted half of a lateral raise and long when the arm is adducted across the body. He references three studies that found 130-190% more growth in quads, biceps, and calves when training at longer lengths. The only deltoid study compared dumbbell and cable laterals but showed no difference. Jeff's hypothesis is that the study had subjects stop at the side, missing the advantage of cables—cross-body adduction. He therefore recommends sweeping the cable across the midline, and if no cable is available, using a 20° incline bench with a dumbbell Y raise to get a similar stretch. For rear delts, he insists on crossing arms over the body before the pull.

Jeff contrasts linear progression (add 5-10 lbs weekly) for heavy compound presses with double progression for isolation exercises. He explains that trying to linearly add weight to lateral raises leads to absurd end points (50-lb laterals by week 8) and form breakdown. With double progression, you pick a range of 10-12 reps, start at the bottom, and add one rep to one set each week. After 3-4 weeks you increase weight and drop back to 10 reps. He notes that as an advanced lifter, you might only manage one extra rep per week across all sets, and that's enough. When even that stalls, you rotate the exercise—dumbbell to cable to machine—restarting the progression, which provides a novel stimulus and allows continued overload.

Jeff cites a cadaver study of 60 shoulders that dissected the deltoid into seven intramuscular segments. The posterior head splits into three tendons, the anterior into three, and the middle has one. He argues that training only the classic three heads ignores these intermediate segments. To address them, he prescribes incline dumbbell Y raises (lifting up and out in a Y) to hit the A2/A3 fibers, and 45° cable rear delt pulls (stretching the arm across the body at 45° then pulling down and back like pulling an arrow from a quiver) for P1/P2. He emphasizes the shoulder's massive 3D range of motion as a cue to train in all dimensions.

Jeff asked people to first perform lateral raises without specific cueing, then with the instruction to picture holding a long shovel and scooping sand out to the side, keeping shoulders down. All participants reported harder, more delt-focused sets. He noted that traps unavoidably engage as the scapula rotates upward at the top, but the cue helps activate side delts earlier in the range of motion, which he believes can lead to better long-term development. This experiment, though informal, aligns with his coaching experience, especially with women who often want to minimize trap growth.

The study found the posterior head branches into three tendons (P1, P2, P3), the middle head has a single tendon, and the anterior head also branches into three (A1, A2, A3). Each segment has a slightly different line of pull, meaning exercises that move in-between the classic planes can bias these fibers. Jeff suggests incline dumbbell Y raises to hit A2/A3, with the arms moving upward and outward in a Y pattern, and 45° cable rear delt pulls for P1/P2, pulling across the body at an angle. He argues that the shoulder's ball-and-socket joint gives massive 3D freedom of movement, and training in all three dimensions capitalizes on this anatomy for a truly rounded look.

Jeff wired himself up during a machine shoulder press and recorded EMG data. The side delt showed higher electrical activity than the front delt, meaning the movement isn't just a front-delt exercise. This aligns with biomechanics: during vertical pressing, the arm moves in the frontal plane, which heavily recruits the lateral deltoid. He emphasizes that this doesn't mean you abandon lateral raises, but a heavy overhead press that gets stronger over time provides a massive mechanical tension stimulus to the delts as a whole.

Jeff notes that the study had subjects stop the cable at their side, just like a dumbbell. By not crossing the midline, they didn't exploit the cable's ability to maintain tension in the adduction (lengthened) range. He advocates for a cross-body cable lateral raise or Y raise, where the arm sweeps across the body at the start, creating tension from a maximally lengthened position. He also recommends lying incline dumbbell Y raises as an alternative if no cable is available. His takeaway: for delts, include both lengthened and shortened exercises, but most people overemphasize short-length work; cross-body cable laterals are his go-to for balanced stimulation.

Jeff emphasizes that just picking weights at random and doing the prescribed reps won't drive long-term gains; tracking what you actually lift and having a program that adapts is crucial. The app will feature detailed analytics, allow users to load his existing programs, and automatically adjust volume and intensity based on performance. The heavy discount for current MacroFactor members is intended to encourage early adoption.