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THURSDAY DEEP DIVE: THE STRENGTH MOVE
Sunday’s issue introduced Side-Lying External Rotation. Today we add two additional positions and explain the tendon loading protocol that is distinct from standard muscle hypertrophy loading and more relevant for rotator cuff health after 60.
THE TENDON LOADING PRINCIPLE
Tendons respond best to:
Slow eccentric loading — a 3 to 5-second controlled lowering from the top of external rotation
Isometric holds at end range — a 2 to 3-second hold at the top before lowering, creating the tensile load the tendon needs to remodel toward greater stiffness and strength
Lower weight than expected: the infraspinatus is small. 3 to 5 lbs with perfect form and slow tempo is more effective for tendon health than 8 to 10 lbs with rushed mechanics
Higher frequency over higher volume: two to three sets three times per week produces better tendon adaptation than five sets once per week
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PROGRESSION 1: SIDE-LYING EXTERNAL ROTATION (SUNDAY’S EXERCISE)
Apply the tendon loading protocol:
3-second concentric (lifting the forearm), 2-second hold at top, 4-second eccentric (lowering)
12 to 15 reps at this tempo — if the tempo cannot be maintained, the weight is too heavy
3 sets, 3 times per week
PROGRESSION 2: STANDING BAND EXTERNAL ROTATION WITH TOWEL CUE
Best for: People who want to perform external rotation standing, or who are using a resistance band rather than a dumbbell.
How to do it:
Anchor a resistance band at elbow height, hold the end in the hand farthest from the anchor
Elbow bent at 90 degrees, pinned to the side — place a small folded towel between the elbow and the rib cage
Rotate the forearm away from the anchor against the band tension
3-second pull, 2-second hold, 4-second return
12 to 15 reps per side, 3 sets
The towel under the elbow is not optional: the moment the elbow loses contact with the rib cage, the deltoid compensates and the infraspinatus disengages. The towel provides the sensory cue to maintain elbow position and keeps the load on the correct muscle.
PROGRESSION 3: PRONE T WITH SIMULTANEOUS EXTERNAL ROTATION
Best for: People who have performed Progressions 1 and 2 consistently and want to integrate external rotation into a full posterior shoulder sequence.
How to do it:
Lie face-down, arms out to the sides at 90 degrees, elbows bent — a field goal post position
Simultaneously raise both upper arms off the floor (T raise) and rotate both forearms upward toward the ceiling (external rotation)
At the top: upper arms are parallel to the floor, forearms are pointing toward the ceiling
Hold 2 seconds, lower slowly
10 to 12 reps, 3 sets
What this trains: this combines mid trapezius activation (from the Y-T-W in Issue #35) with simultaneous infraspinatus and teres minor activation. It is the most functionally integrated posterior shoulder exercise available without equipment and directly reinforces the posture patterns established throughout this series.
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COMING UP
Saturday closes out Issue #38 with the rotator cuff and shoulder health equipment toolkit, and the clear clinical indicators that warrant professional assessment before home exercise.
Still moving forward,
— The SIM60 Team
simsixty.com · Educational content only. Not medical advice.
