Leg extension and leg curl exercise equipment are commonly found in gyms and fitness centers. These machines are used to target the muscles in the quadriceps (front of the thigh) and hamstrings (back of the thigh) respectively. The leg extension machine typically consists of a seat, backrest, and a padded bar that rests on the front of the shins. The user sits on the seat with their legs bent at a 90-degree angle and extends their legs to lift the weight by straightening the knees. This movement primarily targets the quadriceps. The leg curl machine, on the other hand, typically consists of a bench or seat with a padded bar that rests on the back of the ankles. The user lies face down on the bench and curls their legs to lift the weight by bending the knees. This movement primarily targets the hamstrings. Both of these machines can be adjusted to accommodate different body sizes and fitness levels. They are often used as part of a lower body strength training routine to build muscle, improve balance, and increase overall leg strength.