"The importance of moderate consumption of wine by athletes subjected to fatigue and stress is confirmed by the sedative and euphoric properties that contribute to the maintenance of psychophysical strength".
In short, a moderate amount of wine is good for the heart and amplifies the benefits of exercise. Not to mention that among the properties of wine there is the reduction of "bad" cholesterol in the blood. Every athlete knows that he cannot drink wine just before a competition or workout and that, before training, he must eat carbohydrates but on off days, when athletes are not training, wine is a great way to both unwind and strengthen at the same time. After all, even athletes are entitled to some healthy relaxation!
If you are only allowed a glass, you'd better make it a good one. Your best bet is a Brunello di Montalcino.