Our expert says:
500 Cal in 20 minutes is very high. I'm not sure I'd trust the numbers those machines produce - they are just estimates, after all.
I'm not sure it matters though - if it's 300 or 600, what difference does it make?
If you're trying to gain muscle mass, then you need to do weight training as well, not cardio. Lifting weights is the best way to gain muscle mass, and the cardio you're doing now is for fitness. Regarding the other equipment, can you not just lower the intensity so that you don't have to breathe too much? You can control how hard it is, and maybe cycling slower or walking rather than running, until you get fitter, will help you add variety to the training?
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