You can train heavy kettlebells for low reps while working your cardio, or swing 30-to-40 minutes with lighter bells allowing you to focus on fat burning while maintaining muscle mass.It offers extreme versatility for training in your off-season as well as pre-contest!he kettlebell swing is ideal for weight loss because it's no impact and it torches fat like no other workout can. Yet it also can build some solid, no-nonsense muscle while improving your cardiovascular strength and endurance. This is why bodybuilders should be using and training the kettlebell swing like crazy!