There's not much you can do in 15 minutes. You might be able to make a quick meal, watch half an episode of a sitcom or pop to the shops, but did you know that you can do a workout?
Ronan Murphy from TonedFit has come up with a brand new #FitBy15 challenge, and all you need is a chair, a weight and yourself.
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In a Mind Yourself Now special, Ronan joined Dermot and Dave to explain what's involved and how you can get involved.
You can grab Ronan's tips by clicking play above and check Ronan's website for more information on signing up to Ronan's Christmas challenge.
