Our expert says:
I would say that given the choice of these two, I would go for the every day option. But of course, the third option, which is probably better than both, is to do 40 minutes every day. If you're just starting out, then that's probably a bit much - you either need a rest day in between or you should train less each day, so the 20min option gives you that. But eventually, I would suggest that you aim for five days a week of 40 minutes each day, that's probably the ideal target, because you're right, the duration is important but so is the frequency - training every other day compromises this.
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