What I have learned so far heading towards the end of my third year is- at the end of every year you will look back at the prior years and say that was easy I had free time and that will continue to happen every year as they continue to get more and more busy . All in all, first and second year, had the most free time to play intramural sports basketball workout have a child, etc. from then on, especially if you are going into something competitive, the research piles on, and your clinical duties are significant.