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What is the best way to spend 2h/week on Cardio (Vo2) training for biking?

I'm a 46 year old male. I mountain bike pretty hard at least one day a week. I've been doing High Intensity Interval Training off and on for the last year and it's really improved my Vo2Max (which is ...
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2answers
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How worried should I be about overexertion?

I'm fairly young (about 30), and I ride my bike almost every day (commuting) and try to push myself, so I'm in decent shape. I also like to do longer rides, which involve riding steep roads up a ...