Years ago, a close friend advised me to make exercise part of my daily routine. At the time, I was already going to the gym 2-3 times per week and felt I was doing the necessary in the fitness department, but they encouraged me to exercise daily. They said I should see doing 20 mins of vigorous exercises as a daily necessity. Like cleaning my teeth in the morning, exercise should be a non-negotiable and something I do first thing in the morning, with no excuses acceptable.