Add Yahoo as a preferred source to see more of our stories on Google. Most gyms have plyometric boxes. They're also found in parks with public workout areas. Photo: Getty Images Building body strength ...

The fourth workout of this seasons CrossFit Open has been announced, and our first piece of advice for 20.4 is this: start and . You'll be doing box jumps, single-leg squats, and clean and jerks.

New perk: Easily find new routes and hidden gems, upcoming running events, and more near you. Your weekly Local Running Newsletter has everything you need to lace up! Subscribe today. Box jumps are a ...

Directions: This is an AMRAP (as many rounds as possible) workout. After warming up for five minutes with some light cardio and dynamic stretching, start the timer for 30 minutes. Complete as many ...

Instructor: Adam Knickelbein started taking CrossFit classes back in 2009 and has never looked back. In 2012, he received his CrossFit Level 1 Trainer certification. In 2014 he opened CrossFit Beat ...