As your training in this leg extension exercise improves, you must go even lower, until you manage to hold a position with your knees at a 90º angle.
You should also gradually increase the time you hold the position, until you are able to hold it for 1 whole minute and repeat
it after a 30 second break until completing a series of 5 movements.
If when doing this movement, or on ending this leg exercise, your knees should hurt, stop doing it and consult the physician who prescribed it.
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