Don't let sore knees derail your next leg day — you can build muscle and strength in your lower body and avoid joint pain with the proper routine, according to a personal trainer.

Brad and his wife, Julie, demonstrate how to build leg muscle for better balance for those over 60 years of age.

Do it right and you can build muscle by weight training as little as two to three times a week, according to fitness expert ...

How many moves per muscle group does your workout plan really need to build muscle? We've got answers to your workouts.

If you want to pack size, strength, and muscle onto your hamstrings, glutes, and quads, then start integrating these exercises into your leg day training.

Skip the heavy lifting—these 5 simple exercises build muscle, strength, and balance after 40 with less joint strain ...

Hold dumbbells at your sides, feet together. Step out to the right, bend into a squat, and perform a biceps curl. Step back ...

Improve your posture, work your core, and build lower body muscle with this short routine ...

Calf muscles take time and effort to strengthen and build. These exercises and workouts will help you to add size, muscle, and build athleticism in your legs.© VlaDee - Getty Images ...

Single leg squats help build muscle, fix strength imbalances, and improve coordination. Work up from modified exercise using a box or stability ball.