While you might always just try a different exercise, we like DailyBurns tips for modifying some classic moves.

(Do a full set before switching sides.)

Another helpful tip is to do squats with your back on an exercise ball on the wall.

Check out the link below for more modifications.

5 Workout Modifications to Go Easy on Your Knees| DailyBurn

Photo bywww.localfitness.com.au.