Here’s a bit of evidence that Crossfit Charlotte is one of the toughest gyms in town: trainers from other gyms come here to work up a sweat. Owner Andy Hendel is a former NFL player who shows no mercy when it comes to demanding the best out of his athletes. The Crossfit program (high-intensity circuit training that addresses areas of strength and endurance) will work your body like no regular treadmill and weight-machines workout can.