Pre- and post-workout nutrition receives a lot of attention, and rightfully so, because both are important. But if you’re looking to gain muscle, drinking a shake with protein and carbs during your workout is a great way to sneak in some extra calories without making a meal. Mid-workout nutrition will give you a quick shot of carbs and calories that can keep your energy up and help you train harder. You just need to be conservative with the amounts you consume so you don’t upset your stomach. Start with a modest shake of around 20g of protein and 40g of carbs.