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Quadriceps
Calves, Glutes, Hamstrings
Position self on hack squat machine, back against pad, shoulders under pads.
Feet shoulder-width on platform, toes slightly out.
Grip handles, release safety bars.
Start legs extended (not locked).
Inhale, slowly lower platform by bending knees.
Descend until thighs below parallel.
Keep back against pad.
Exhale, push through heels to return to start.
Repeat.