These knee exercises are recommended for those with difficulty squatting, climbing stairs, or balancing on one foot. The first three exercises - quad sets, hamstring sets, and straight leg raises - involve minimal movement of the knee joint while strengthening muscles around the knee. Additional exercises include bridging to work the inner thighs, knee extensions to strengthen the thigh muscles, heel raises for balance, and butt kicks to stretch the hamstrings. Perform 1-2 sets of each exercise daily, holding contractions for 10 seconds and repeating 20 times to rebuild knee strength.