Who was summertime me? I don’t recognise that running, strength-training, “Japanese walking” powerhouse – winter me is an immobile hermit.

I know, I know, staying active in the colder months is great for your health.

But I just can’t bring myself to work out often now that the clocks have gone back. The motivation simply won’t kick in.

If that sounds like you, though, some reassuring (or depressing, depending on your mindset) news: you’re not alone. There is real science behind your cold-weather sluggishness.

No wonder we tend to spend more time staying still in the final season of the year.

Why is it so much harder to exercise in winter?

If you are a member of the many people affected by Seasonal Affective Disorder (SAD), your motivation to head to the gym

© HuffPost