If you are looking for a real challenge, then try doing the RKC Plank. Invented by a former Soviet special forces trainer, Pavel Tsatsouline, the Russian Kettlebell Challenge or RKC plank is a ...

Whether you love planks or hate them, there’s no denying they’re one of the most effective full-body exercises around. If you need a little variety, strength coach Jim "Smitty" Smith, C.P.P.S., owner ...