Not exactly a health drink but when I need something other than water I mix a little unsweetened Kool Aid(grape, strawberry, lemon or orange), Truvia to sweeten, and ice. No calories and takes care of my sweet tooth.
Right now I'm on a stationary bike as many days a week as I can. My Concept II Rower finally proved too much for my ailing back and I had to quit rowing after 30 years. Several dog walks a day as well.
