How to perform the hack squats correctly and safely which will help prevent injury.
Muscles Involved in order of importance:
Slowly lower the weight down until your legs are a little bit under 90 degrees.
Then push with your legs back up until you are at the starting posistion.
Safety: Doing this exercise should be done with a spotter if you think the weight will be a bit too much, I also have a spotter when doing this exercise just to be on the safe side.You can try different foot positions when doing this exercise to put emphasize on your legs