Summer. Long days spent reading by the pool; punctuated an occasional cooling dip in the water. Bright sunshine that not only warms my heart and skin, but increases my Vitamin D and serotonin levels to leave me feeling healthy and happy; these are some of my favorite things. I’d much rather be hot than cold but when I’ve had enough of the heat I just move indoors . . . GRYROTONIC® exercise is an indoor sport, after all.