Plank

The plank is an isometric hold in a prone position: forearms on the ground, elbows under shoulders, toes on the ground, body in a straight line from heels to head. The core (rectus abdominis, transverse abdominis, obliques) works to prevent the hips from sagging toward the floor — that anti-extension demand is the training stimulus.

The plank trains a specific quality: the ability to hold a neutral spine under resistance. That translates directly to the squat, deadlift, and overhead press, all of which fail earlier in lifters whose core cannot maintain a rigid midline under load. It does not build significant muscle mass in the rectus abdominis — for aesthetic core development, loaded flexion exercises (cable crunches, hanging leg raises) do more.

Most programming uses time rather than reps: hold for 30 to 60 seconds per set, 2 to 4 sets. Beyond 60 seconds the exercise becomes an endurance task rather than a strength-anti-extension task, and the training benefit diminishes. If 60 seconds is trivial, add load (plate on the upper back) rather than extending the time.

In LiftProof, planks are tracked as an accessory exercise — duration, and optionally added load. They fit cleanly at the end of any training session as a short core finisher. Variants like side planks, long-lever planks, and plank rows progress the exercise without adding time; these are worth rotating in once a 60-second plain plank is easy.

• Elbows under shoulders, forearms flat on the ground
• Straight line from heels to head — no sag, no pike
• Squeeze the glutes and quads — they lock the hip position
• Brace the abs as if bracing for a punch
• Breathe normally — do not hold the breath through the set

• Hips sagging toward the floor — lumbar extension instead of neutral spine
• Piking the hips up — the exercise becomes a downward dog, not a plank
• Looking up and craning the neck — keep the neck neutral, look at the floor
• Extending the duration when the form breaks — a 30-second clean plank beats a 90-second broken one

• squat→
• deadlift→