Want a stronger core?

Hey JKC readers,

Sick and tired of doing crunches and tearing your head off your neck when doing sit-ups?

My article "Planks and Bridges" published in the July-August issue of IMPACT magazine is now on-line.

Check out the anti-rotation exercise progression here: http://tinyurl.com/l4mdof

Let me know what you think,

Thanks for reading,

Jon-Erik Kawamoto