An amputee CrossFit trainer is teaching other disabled people how to push their bodies to the limit. Twenty-six-year-old Zack Ruhl can impressively bench press 420 lbs and do pushups in his wheelchair. Last year he opened up his own CrossFit gym where he offers free classes to other amputees. Zack was born without thigh bones and brittle bones in his legs so doctors amputated them over the course of his life.
