How do you know if you're fit enough? This month, Ollie looks at how to test your fitness

Mum-of-three Sarah Best, 51, took up strength training seven years ago and this year qualified for the Hyrox World Championships in Stockholm. She shares some of her workout routine and how strength training has changed her body and her life.

No runner can run on running alone – at least not for long. If you want jogging joy to last a lifetime, strength and conditioning is non-negotiable. Group classes can be a brilliant way to show up and

Your guide to the opportunistic winter bulk

This session – from Gymbox PT Ben Foulis – will target every major muscle group, with the three sections combining for increased mobility, muscle growth, strength, aerobic fitness and muscular endurance

GORKA MÁRQUEZ