When looking at the physical characteristics of fitness models, it is easy to see that the majority have relatively lean muscular bodies with relatively high aerobic capacities. Bodybuilders build their muscle bulk through high intensity and heavy repetition training. The majority of the public at least has some degree of access to weights and weight machines in their home and gym. There are many programs designed to help people get fit and build their muscle bulk. The most popular of these programs is the "Cycle" system, which has been used successfully by thousands of men and women for building muscle mass and losing weight.
To build the larger muscle groups (tensors and brachialis) in your arms and chest, you will need to work mainly with lower weights and high repetition. Most bodybuilding workouts consist of high repetition with low weights and therefore do not train the smaller muscles in your arms and chest. To build up the muscles in your forearms and calves, you will need to spend much less time working out and more time doing cardio exercise such as running or jogging. Both the arm and the leg muscles are worked during strength training. When you lift weights your muscles contract, this makes your muscles work harder than they would do if you did not lift weights.
In addition to working out your legs and arm muscles the muscles in your back and buttocks also become stressed and worked when you do your squats, dead lifts and other exercises. Building muscles in your back and butt are important for helping you maintain proper posture. Your large muscles such as the quads and hamstrings are also important for sitting up straight and moving properly. Building up your quads and hamstrings also helps your lower back support your spine while your arms, chest and shoulders rise up to get the most benefit from your workout.