All of which brings me to the hollow body hold. I’ve tried a lot of core exercises — including the side-to-side crunch, the standing bicycle crunch, the jackknife sit-up, and the side plank ...

hollow body holds; and mountain climbers. Leon Bolmeer, boxing trainer and director of UK-based Geezers Boxing, told Gloucestershire Live that these moves should be performed in three sets of 10 ...