Because these small muscles tire before the large ones, it is logical to work with dumbbells, barbells and other small weights before moving on to the larger machines. In this way, your smaller muscles can get a break while you are working out your larger muscles.Alpha Fuel Testo A strong core is vital for well-rounded fitness. A strong core makes everything from running to weightlifting easier. Sit-ups are a classic exercise and one that builds the core muscles. Doing sit ups can also increase the range of motion you experience. Stronger abs are able to work longer and harder.Alpha Fuel Testo A kickboxing class is a great way to get fit.