For those who haven’t heard, ‘flexercise’ is the key to getting fit and having fun at the same time. If you’ve been hiding under a stone, then what this means is – as perfectly coined by Ruby Warrington in Grazia – is that: “Flexercising allows you to dip in and out of everything to keep things interesting”. There are new and create ways of getting into – and staying – in shape which are easily accessible and affordable. But how many of us are taking advantage? In one week I have done a hefty swimming session, got ruined at two spin classes, been for a glutes-busting cross-country run, and squeezed in a weights session. And I’m feeling pretty bored. There is so much more out there I have yet to incorporate into my training schedule. Doing the same thing all the time is, to be frank, dull as hell, and it’s vital to keep…