Team Grenade® endurance Champion, James St-Leger puts Kris Gethin, Deputy Editor in Chief of Bodybuilding.com, through an extreme core strength workout. This video has been posted twice by BodyBuilding.com and collectively achieved over 2,000 likes, 400 shares and 50,000 views on YouTube. Please take a look at the Grenade® YouTube channel
Extreme Core workout – James trains Kris Gethin
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