1. Squats:
   • Stand with feet shoulder-width apart.
   • Lower your body as if sitting back into a chair.
   • Keep your knees aligned with your toes.
   • 3 sets of 10-15 reps.
2. Lunges:
   • Step forward with one leg, lowering your hips until both knees are bent at 90-degree angles.
   • Push back to the starting position.
   • Alternate legs.
   • 3 sets of 10 reps per leg.
3. Leg Press (if you have access to a gym):
   • Sit on the leg press machine with your feet shoulder-width apart on the platform.
   • Lower the platform until your knees are at 90 degrees, then push back up.
   • 3 sets of 12-15 reps.
4. Step-Ups:
   • Use a sturdy bench or step.
   • Step up with one foot, bringing your other foot onto the step.
   • Step back down and repeat, alternating legs.
   • 3 sets of 10-12 reps per leg.
5. Hamstring Curls:
   • Lie face down on a mat.
   • Slowly bend one knee, bringing your heel towards your buttocks.
   • Lower and repeat.
   • 3 sets of 12-15 reps per leg.
6. Straight Leg Raises:
   • Lie on your back with one leg straight and the other bent.
   • Raise the straight leg to the height of the bent knee.
   • Lower slowly and repeat.
   • 3 sets of 10-12 reps per leg.
7. Wall Sits:
   • Lean against a wall and slide down until your thighs are parallel to the ground.
   • Hold this position for 30-60 seconds.
   • 3 sets.
8. Calf Raises:
   • Stand with your feet hip-width apart.
   • Rise up onto your toes, then slowly lower back down.
   • 3 sets of 15-20 reps.

Remember to warm up before exercising and consult with a healthcare professional if you have any existing knee issues.