I also recommend Xtend during workouts. I do protein shakes after with 400 IU vitamin E (antioxidant) and creatine for recovery. Sometimes I'll do some sugar after as well, but I am a hard gainer. I really wouldn't recommend that for people that seem to have no problem putting on weight ; )
You can also do protein, creatine, and some carbs before, although I wouldn't recommend RIGHT before - an intense workout will upset your stomach. I like nature valley bars for some nice complex carbs with a moderate amount of sugar. Some also prefer to take creatine with the first meal of the day vs. before the workout.
Consuming some sugar during the workout, with Xtend, will also help with endurance - I like dextrose or mixing it with gatorade. I do go sans sugar a lot though too. Again, if you seem to pack on weight easily, and are really trying to shed fat, I would not recommend added sugar.
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