Without a doubt, leg workouts cover the largest muscle groups in your body. Find leg exercises programs and tips for all your leg muscles including your hamstrings, quads and calve muscles.
One interesting thing about leg workouts in general is that when you work them out doing resistance training, you will indirectly also increase the strength and size of your upper body as well.
The reason for this is because the leg muscles are so big, when stressed they will release a large amount of the hormone testosterone. Since testosterone is an anabolic hormone in the body, the more of it you have circulating through your system the more chances you will grow. If you happened to have done an upper body workout within the last few days, this will encourage growth in this area as well. So never leave this training out!
Far too many men in particular make this mistake and if anyone should be doing exercises for this area, it is them!
The main leg muscles are the quads, the hamstrings, the calves and the glutes. The quad has a few different heads to it, the lateral head (vastus lateralis), the medial head (vastus medialis), and the middle head (vastus intermedius). The hamstring as well has two components, the short and long head. Your glute (bum) is made up of the gluteus medius, gluteus minimus and the gluteus maximus) and lastly your calf is made up of the soleus and gastrocnemius.
Keep in mind that any workouts done for this area of the body, since they tend to be more intense in nature, will require slightly more rest afterwards. It would not be a wise idea to do a really hard workout in the weight room and then attempt to run some high intensity sprints a few hours later, for example (and even worse to try doing the sprints right before or after). Make sure you are supplying your body with proper rest after the workout so you can grow back stronger and continue to see results with your program. If you do, you it will be time well spent.