Friendly and cautionary note: Not everyone is going to be able to do all of these workouts, and some people won't be able to do any of them. And what's hard for one person might be easy for another — it all depends on your individual level of fitness. Before you begin any new exercise regimen, you should talk to your doctor about what's safe and right for you. And if you feel faint or dizzy or pain during the course of any of these workouts, stop immediately and seek medical attention.
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