A concussion occurs through a bump or blow to the head causing the brain to move inside the skull, changing chemicals and damaging brain cells.
You don't need a court. These can be done at home!
1. Run when the conditions are coolest. Ideally in the early morning or evening.
U.S. Lacrosse has some great resources for coaches and players. Like this Waterfall Drill used for midfielders concentrated on working on passing.