Knee injuries rarely come out of nowhere. In most cases, they develop over time as the muscles, tendons and ligaments surrounding the joint gradually lose strength or stability. Building that support back up, or developing it before problems emerge, is one of the most reliable ways to protect long-term mobility.
The eight exercises below are drawn from physical therapy programs and strength training practice. Each targets a different muscle group that contributes to knee health, from the quadriceps and hamstrings to the glutes and inner thighs. Performed consistently and with proper form, they can reduce chronic injury risk, improve joint control during movement and ease existing discomfort.
Anyone experiencing this pain during exercise should stop and consult a physical therapist before continuing.
Exercises that strengthen the front and back of the knee
Wall sits develop the quadriceps through an isometric hold that places minimal stress on the joint. Stand with the back flat against a wall, slide the feet forward and lower into a seated position with knees bent at roughly 90 degrees. Hold the position as long as form allows, then return to standing. Three to four sets is a reasonable target, and the exercise is particularly suitable for people in early recovery from injury.
Hamstring curls address the back of the knee, where weakness often goes unnoticed until something goes wrong. Using a hamstring curl machine, lie face down with the ankles positioned under the padded bar. Lift the heels toward the body, then control the weight back down. Ten to 12 repetitions per set, completed across three to four sets, is a standard starting point.
Leg extensions isolate the quadriceps and appear frequently in physical therapy programs for this reason. On a leg extension machine, begin with the knees bent at approximately 90 degrees and extend the legs while contracting the quadriceps. Controlling the movement on the way down is as important as the extension itself.
Romanian deadlifts work the posterior chain and support knee stability through hip hinge mechanics. Standing with feet hip-width apart and holding dumbbells, hinge forward at the hips and lower the weight toward the knees before returning to standing by extending the hips and contracting the glutes. Three to four sets of 12 to 15 repetitions builds meaningful strength over time.
Exercises that target the hips and glutes
Hip bridges activate the glutes, which play a larger role in knee stability than most people expect. Lie on the back with knees bent and feet flat on the floor. Engage the core, then lift the hips toward the ceiling, hold briefly and lower back down. Several sets of controlled repetitions, with attention to not letting the knees collapse inward, makes this exercise effective.
Clam shells isolate the gluteus medius and minimus, two smaller muscles that help keep the knee tracking correctly during movement. Place a resistance band just above the knees, lie on one side and lift the top knee against the band’s resistance. Three sets on each side, with deliberate control throughout, is sufficient.
Step-ups combine glute and quad work while also training balance and coordination. Using a sturdy elevated surface, step up with one foot and bring the other foot up to meet it before stepping back down. Repeating on both sides for several sets builds functional strength that transfers directly to everyday movement.
The adductor machine targets the inner thigh muscles, which contribute to proper knee alignment. Seated with the back flat against the machine’s support, squeeze the legs together and control the movement back out. Sets of 15 to 20 repetitions build the endurance these muscles need to do their job during sustained activity.
