To celebrate our Body Issue, we've kicked off a 30-Day Challenge designed by celebrity and Victoria's Secret Angels trainer Dan Roberts to boost our energy and fitness levels for all the summer happenings we plan to get into. 

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The move: V Sit

This is an effective abdominal and core exercise that works the rectus abdominis, the external obliques and internal obliques while also engaging the hip flexors.  

The difficulty level: It can get as difficult or easy as you want, based on how much arm power you use to stabilise yourself. Lean back until you can feel your abs are engaged and then release your hands to hold. This will bring on the burn.

The burn factor: 6/10

Join us in the fun and show us your progress by instagramming and tweeting us at @ELLEUK and @ELLFitTeam, using the hashtag #ELLEFit30