So I'm doing Insanity Max: 30 (to help me get in better shape - can't afford a gym membership right now) during the video's last maybe like 6 minutes. I try to keep going after that but it feels like I'm literally running on empty. But I feel like it's just cardio, so am I doing any good by continuing the workout? Or pushing myself? Or is it just bad for my heart?
(Also, I'm only 26, just got lazy after the holidays, so this is my first real workout in like 3 months.)
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