£14.99, available from all good bookshops; ebook, £12.99, available from e-tailers and bloomsbury.com Thehiitbible: Superchargeyour bodyandbrain is a good guide for both newcomers to HIIT and those that want to push on with their training. The succinct step-bystep instructions for the exercises are great and, if you like a bit more detail, a longerform description is available too. The suggested workouts offer plenty of variety with bodyweight- only exercises on offer, as well as those needing more equipment – plus, clever tweaks to familiar moves certainly helped to ramp up the intensity. The author’s emphasis on nailing each move before upping the level seems sound and if you are more of a home exerciser, there’s enough content to keep you going, with the 14-day and 28-day challenges providing lots of motivation. The quick answers section at the back should help with any queries and the science of HIIT is well explained without leaving you feeling too overwhelmed with information. A great reference point for HIIT fans and newbies.