I was recently talking with a perspective client, and they were telling me about how hard the workouts were that their previous trainer put them through. This person felt that the workouts were effective because they were difficult. Don't get me wrong, I love hard work. Let me repeat that - I LOVE hard work. But, only if it serves a purpose. For instance, let's take two athletes. I will spend an hour with athlete one working one his/her sprint technique. Athlete two will spend the entire hour doing jumping jacks. By the end of the hour, which one do you think got better?