If you're going to put the effort into a high-intensity workout, you want to reap the full benefits. But many people don't, simply because they're lacking the B vitamins their body needs to bounce back from strenuous exercise and build muscle. B vitamin deficiencies can also affect your performance while you're competing, so it's worth the small effort to make sure you're getting enough.

Current recommended daily amounts of B vitamins might not be enough for your body if you're an especially active person. Athletes are often the same people watching their fat intakes, so they cut back on B vitamin rich foods like dairy and red meat. If you're not getting enough B vitamins from your diet, make sure to add some kind of supplement to your daily routine to get the maximum benefits from your training.