Step away from those PJs...

We're all more than a little guilty of winter indulgence/laziness. But wouldn't you prefer not to have to sign up to bootcamp/F45/a half marathon come spring, just so you can fit into your denim cut-offs again? Beraing this in mind, trainer James Anderson has a winter fitness challenge for you. Are you ready to take it?

Click through the gallery above to see what it is.

3 ways to get in the zone (and avoid weight gain) this winter