Versa Climber has no competition as far as stamina. Unfortunatly most gyms dont have them. People either dont want to try them or think they are to difficult. My gym has one and I hate that fuckin thing but its the best cardio workout I have ever had.
The "best" form of cardio is the one you enjoy the most. If you like it you're more likely to do it. I enjoy cycling but I find rowing to be the most exhausting. Point a fan at yourself if training stationary.
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