The Tumblr Gym: 25 Fitness Swaps that could change your life.
Fitness
1. Planks for crunches. Okay okay, have we said this enough? Crunches may not be the secretto six-pack abs. Give planks a try instead to work that whole core. Extra points for holding it for a minute straight!
2. Interval workout for relaxed run. Congrats on that 20-mile…
(Source: tumblrgym)