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Ratona Harr, a fitness instructor, felt an "explosion" in her chest while teaching a spin class. Her students called 911, and she soon learned she'd suffered a "widow-maker" heart attack. Widow-maker ...

Over the years, I've tried various fitness classes ranging from HIIT, dance cardio, and indoor cycling to lower impact workouts like Pilates and yoga, mixing in weightlifting and treadmill work at the ...