Our expert says:
No, it's not a waste of time. Every little bit counts, so if the alternative is nothing, and you have only 20 minutes available to train, then of course it's valuable.
40 minutes gives you much more flexibility and that means more variety, and a bigger benefit, of course, because everything is doubled up. The general recommendation by the "experts" is to aim for 40 minutes a day, but they also acknowledge that if you can ACCUMULATE that time during a day, then you're meeting the guidelines for health.
So if it's a 20 minute cardio session, plus a few other activities in the day (taking stairs, walking further etc) then you're meeting health guidelines.
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