For those with poor balance, Levine suggests resting the upper part of the foot on a chair placed behind you and using a chair back in front of you for support. Players who walk should pay special attention to the calf muscles, since a typical round can add up to at least three miles of walking. Better to use your forearm against the wall to allow the stretching to occur at the calves. One easily overlooked conditioning need is hydration. Dehydration can lead to heatstroke in just a little time.
Recreational golfers are notorious for drinking too little or grabbing a beer.
Best to drink water or lemonade, he says, but not just when you're thirsty. If you're feeling clammy, have pale skin or profusely sweating, it's too late to do anything preventive. You should find a nice shady place and get fluids. If it starts to hurt, stop. By the time we see them, there's a bigger problem.