BYT

Squat · Machine · Add load

Hack squat

Shoulders under the pads, back against the sled. Feet shoulder-width, a little in front of the hips, whole foot down.

Hack squat
  1. 1Unlock the sled and sit until the thighs are near parallel.
  2. 2Knees track over the toes. Heels stay down.
  3. 3Drive up and stop just short of locking the knees.

Easy to miss: Heels lifting, knees caving in, or bouncing out of the bottom.

Muscles

Copper on the figure is a prime mover. The softer tone helps.