Testo Boost X It is acceptable to cheat a little when lifting. Slightly using your body for pumping out a few final reps is a great way to increase your workout volume. You don't want to cheat a lot, though. Your rep speed should be controlled. Be sure not to compromise your form.Testo Boost X Some people have problems increasing all of their muscle groups at similar rates. Use fill sets to target your problem muscle groups. Fill sets are brief sets of exercises that target the slow-growing group. Do them a few days after the last workout in which the group was strenuously worked.