The Timelord has a plan for summer.
Of course, being a master of time has its advantages, when "summer" ends, who knows how much work Boston Celtics big man Robert Williams will have put in? However long Williams chooses to make his offseason in terms of training, it certainly doesn't lack in areas where he plans to work.
Said Robert of what he is going to focus on (per the Boston Herald's Steve Bulpett):
"Everything ... I have to work on everything.