For an activity to be vigorous, you need to work at 70 to 85 percent of your maximum heart rate, according to the American Heart Association . Examples of vigorous exercise include: running. cycling at 10 mph or faster.

What happens when you exercise strenuously?

Adrenaline levels rise, which stimulates the heart to beat faster. Capillaries in the muscles open wider, increasing blood flow there by up to 20 times. The muscles of the ribcage assist the diaphragm to pull in up to 15 times more oxygen than at rest. Breathing gets faster but also deeper.

Is it OK to exercise with arrhythmia?

While the type of exercise you can do depends on your arrhythmia, Erica says that the rule of thumb is to choose cardio over weightlifting. “Anything where you have to lift weight can stress your heart. Instead, try cardio or yoga.