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THURSDAY DEEP DIVE: THE STRENGTH MOVE
Sunday’s issue introduced the Dead Bug as this week’s primary core exercise. Today we go deeper — because the Dead Bug is one of the most commonly performed and most commonly mis-performed exercises in functional training.
Most people lower their limbs toward the floor and call it done. The actual work is maintaining a pressed lower back while doing so. The moment the lower back arches, the deep core has disengaged and the hip flexors have taken over. You’re no longer doing a core exercise — you’re doing a hip flexor exercise with extra steps.
The three progressions below build the exercise correctly from the ground up, and the breath cue at the end transforms all three levels.
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PROGRESSION 1: DEAD BUG, ARM ONLY (BEGINNER)
Best for: Anyone new to the exercise, anyone returning from a lower back issue, or anyone who cannot keep the lower back pressed into the floor during the full movement.
How to do it:
Lie on your back, knees bent at 90 degrees, feet off the floor, both arms pointing toward the ceiling
Press the lower back firmly into the floor — there should be no space between the back and the mat
Slowly lower one arm overhead toward the floor — legs stay completely still
Return the arm to start, lower the other arm
The challenge: keep the lower back pressed throughout every arm movement
8–10 reps per arm, 2 sets
Why start here: Most people discover they cannot maintain the pressed lower back even during the arm-only version. This is information, not failure. The deep core is not strong enough yet for full contralateral limb movement, and practicing the full version with a lifted back trains the wrong pattern.
PROGRESSION 2: DEAD BUG, FULL CONTRALATERAL EXTENSION (INTERMEDIATE)
Best for: People who can maintain the pressed lower back through all arm-only reps without any arching. This is Sunday’s featured exercise.
How to do it:
Set-up identical to Progression 1: back, 90-degree knees, arms to ceiling, lower back pressed
Simultaneously lower the right arm overhead and extend the left leg toward the floor
Both limbs hover just above the floor surface — do not rest them
Hold 1–2 seconds at the bottom, then return to start
Repeat on the opposite diagonal — left arm, right leg
5–6 reps per side, 2–3 sets
The diagnostic: If the lower back lifts during the leg extension, the leg is going too far. Reduce the range — lower the leg only halfway rather than hovering near the floor. The lower back contact is more important than the range of motion. Build range as strength develops.
PROGRESSION 3: DEAD BUG WITH RESISTANCE BAND (ADVANCED)
Best for: People who perform Progression 2 cleanly for 6 reps per side across 3 sets and want to increase the anti-extension challenge without adding spinal load.
How to do it:
Loop a light resistance band around both feet
Set up in the standard dead bug position: back, 90-degree knees, arms to ceiling, lower back pressed
As you extend one leg away from the body, the band provides resistance — you must maintain the pressed lower back against the pulling force
The band also pulls the knees apart slightly, adding a lateral stability challenge
Perform the full contralateral pattern: arm and opposite leg extend simultaneously
5–6 reps per side, 3 sets
Why the band changes the exercise: The resistance band adds a load component that requires the deep core to work harder to resist spinal extension. It also introduces a rotational force at the hip as the extending leg pulls against the band, which makes the exercise more three-dimensional. This is a meaningful jump in difficulty from Progression 2 and requires fully established mechanics before attempting.
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THE BREATH CUE THAT CHANGES EVERYTHING
Here is the single most important technical point for the Dead Bug at all three levels:
Exhale slowly and fully as you extend the limbs away from the body.
As you exhale, the transverse abdominis — the deepest abdominal muscle and the primary structural stabilizer of the lumbar spine — reflexively activates. The lower back presses into the floor not just from conscious effort but from the internal pressure created by a full, controlled exhale.
Inhale as you return the limbs to the start position. Exhale again as you extend on the opposite diagonal.
What this eliminates: breath-holding, which spikes intra-thoracic pressure and bypasses the deep core. Most people hold their breath during the hard part of the Dead Bug, which is the exact moment the deep core needs to be working.
Test it: perform three reps while holding your breath, then three reps with a slow exhale on each extension. The difference in how the lower back stays pressed is immediate and unmistakable.
COMING UP
Saturday closes out the week with the equipment deep dive: what tools actually support core health after 60, which popular products are overhyped, and the full week recap for Issue #31.
Still moving forward,
— The SIM60 Team
simsixty.com · Educational content only. Not medical advice.
