Walking treadmill workouts are an easy way to jumpstart a new fitness routine or add variety to an established one. One of the most popular routines is the 12-3-30 treadmill workout, which continues ...
I’ve always been pretty skeptical of viral TikTok workouts like the 12-3-30 workout. They can be created by anyone with an account, after all, so their merits aren’t usually backed by science. But the ...