Coach Caroline and Coach Valerie dig into a summer topic that runners still get wrong all the time: sweating more does not automatically mean training smarter. They start with the old-school mylar sweat suit craze, the idea that extra sweat meant faster weight loss, and why that mindset is still hanging around today. Valerie explains that heat itself is not the problem—running or training in heat can be useful—but adding unnecessary heat stress on top of exercise is where people get into trouble. If you are already working hard outside, your heart is doing enough work without a heavy sweat suit making things worse.

The conversation also explains the difference between healthy heat exposure and risky “make yourself sweat more” habits. Valerie talks about sauna use, warm baths, and hot training rooms as forms of controlled heat exposur ...