There's yet another heatwave hitting the UK and US right now, and unlike my colleagues, I'm a fair-weather runner, so it's officially too hot for me to run outdoors.
But my once-a-week cardio sessions are non-negotiable, so I've turned to the gym and the best treadmills instead. I'm not really a commercial gym user, but if you do have access to a treadmill at home or a local gym, I recommend hopping on and giving this 20-minute running HIIT workout a try.
