The hack squat is a variation of the traditional squat done on a hack squat
apparatus. Most commercial gyms will have a hack squat apparatus.
This exercise isolates the front thighs more so than traditional squats. This
exercises doesn't use the lower back and glutes to the extent that squats
does. However, this exercise does a pretty good job of strengthening and
building the front of the thighs.
The primary muscle group is the front thighs and secondary muscle groups
include the glutes (butt), hamstrings, and calves. This exercise comes close
to traditional squats but the difference is that it takes some of the pressure
off the lower back and glutes.
When doing this exercise, keep your feet firmly on the platform and butt on
the back pad at all times.
Position for the hack squat
1. Firmly plant your feet on the hack apparatus. Keep your back straight
and flat against the hack rest with your trapezius muscles under the shoulder
pads.
2. Place your hands on the hack handles. Keep your head level.
3. Slightly angle your toes outward.
Execution of the hack squat
1. Slowly bend your knees bringing your upper body downward.
2. When your knees are at 90 degrees, slowly push your body upwards back to
the start position. Repeat the movement.