If you want better grades, start exercising more often By Igor Mihajlavic, Saurav Acharya and Igor Mihajlovic · 7 years, 3 months ago "I don't care what the activity is, if it is weightlifting, if it is going for a bike ride, a run, a swim, they're all good. But you can't use your phone, you can't use your computer to watch Youtube," said UBC professor Peter Graf.
