What It Is We recruited TJ to demonstrate some next-level moves designed to put your core strength, stability and control to the test—and he definitely understood the assignment. Over the next few Sundays, we’ll be dropping a new TJ Challenge Move for you to try at Lakeshore. Think your core is up for it? Look for updates on Facebook and here. See you next Sunday for another challenge. Challenge No. 1 These aren’t your basic crunches. They’re more advanced movements, so cont