“You’ve got to work at living because dying is easy.” — Jack LaLanne, the late fitness guruMy Achilles Heel for the longest time in group exercise classes were the gigantic red, yellow, blue or grey exercise balls.My arms started aching whenever an instructor simply announced we’d be using them that session.You would think a reasonably fit person would have no issues with picking up a large ball made of ribbed PVC material and filled with nothing but air. The exercise routines that were in vogue 10 years ago literally killed my shoulders and upper arms to the point I couldn’t go through the entire set. That’s right.