Scott Mathison is an influential figure in fitness, who boasts a large following on social media and who runs a successful business alongside his career in sport. The American-based fitness model and entrepreneur regularly shares his sporting performance and training with his 277,000 dedicated Instagram followers. This time, Mathison amused himself doing squats with a weight bar - a light one of course, but still a weight bar - all while riding on a longboard. The video shows him cruising calmly along a stretch of road, looking as though what he is doing is the easiest thing in the world. The least we can say is that Mathison's technique as well as his balance are rather good, bearing in mind the difficulty of the exercise. A warning though: we advise you against trying this exercise, unless you’ve perfectly mastered longboarding and squats.Check out the video above to see the footage for yourself!