Fitness Tip #6: Nautilus machines are useful for injuries and some bodybuilding and very little else. If you don’t have a recent limiting injury (and even sometimes if you do, depending on what it is) and you aren’t trying to inflate yourself like Mr. StayPuft, you shouldn’t be using isolation machines. By locking your body into place to isolate one muscle group, you totally lose the workout for your proprioceptive and stabilizing musculature – ie. the things you need in every day life and in sports! Get off the machines and pick up a weight (or yourself)!