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

Fitness racing is all the rage right now, but nothing offers quite the challenge posed by a backyard ultra, which tests both body and spirit in equal measure

The competition is taking over cities across the UK. The following circuit – created by Hyrox champion Daria Daspin – gives you a taste of the endurance and functional strength it takes to tackle the real thing. You can do it three ways:

One MH editor took on a month-long curling challenge – 100 reps a day, every day – to see if relentless repetition could finally bring his biceps up to size

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

Struggle to stay in shape when you’re away from home? This any time, any place workout – split into three blocks of three exercises – will rev your metabolism and build lean, full-body muscle