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Legcurl
The leg curl is an isolation exercise that targets the hamstring muscles. The exercise involves flexing the lower leg against resistance towards the buttocks.
Other exercises that can be used to strengthen the hamstrings are the Glute-Ham Raise and the Deadlift.
Leg extension
The leg extension is a resistance weight training exercise that targets the quadriceps muscle in the legs. The exercise is done using a machine called the Leg Extension Machine. There are various manufacturers of these machines and each one is slightly different. Most gym and weight rooms will have the machine in their facility. The leg extension is an isolated exercise targeting one specific muscle group, the quadriceps. It should not be considered as a total leg workout, such as the squat or deadlift.
Squat
In strength training, the squat is a compound, full body exercise that trains primarily the muscles of the thighs, hips and buttocks, quads (vastus lateralus medialis and intermedius), hamstrings, as well as strengthening the bones, ligaments and insertion of the tendons throughout the lower body. Squats are considered a vital exercise for increasing the strength and size of the legs and buttocks, as well as developing core strength. Isometrically, the lower back, the upper back, the abdominals, the trunk muscles, the costal muscles, and the shoulders and arms are all essential to the exercise and thus are trained when squatting with proper form.
Leg press
The leg press works the following muscle groups:
Quadriceps
Hamstring
Gluteus maximus
Calves (partially)
Varying the angle between the sled and the backrest and/or the position of the feet on the plate puts more emphasis on one or the other muscle group.
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