4. Start Lifting Weights
Lifting weights can help speed resting metabolic rate because it builds lean muscle mass, which naturally uses more calories than body fat does. To gain muscle means to increase the amount of metabolic work your body needs to do daily in order to just keep you going, since muscle tissue is more active than fat is. (6) Find a way to practice resistence training regularly, whether this means trying CrossFit workouts or simply using dumbells and performing body resistence moves at home. If you are trying to gain muscle quickly, I recommend ideally doing heavy weight training of six to 12 reps, five days a week for 45–75 minutes.