Two sets of 10 reps of lunges, done correctly, a few days a week can be more beneficial than you think. The lunge is imperative to preserving squat strength. Stand next to a chair if you need some support. Your feet should be a shoulder-width apart. Take a large step forward. Make sure to bend your knee and lower your hips, but DON’T move your knee past your toes. Repeat about 10-15 times  for each leg.