If you are playing club, that is great. Here are some options that the WA Coach Doyle thinks are very beneficial and not as expensive as club.
TURF BURNERS at WA:
Mr Bombaci and his son Connor offer a terrific training program that is held right at WA. I personally believe we saw benefits of this during our season, and this is a great way to continue/increase the workouts! The cost is $250 - http://turfburners.com/
BEANTOWN LEAGUE in Bedford:
Myself, along with the AB and Brookline coach started this league 5 years ago as a way to get our programs playing together in the summer. Building team chemistry is something that is lost in the off-season, while hockey guys play together a lot year round. I will be sending an email out on this later. The cost is $295. https://www.beantownlacrosse.com/
BLUE CHEETAH CAMP in Lexington: For the freshmen guys, this is a GREAT camp. It is run by many terrific HS coaches and has a great focus on improvement! The cost is $340 http://www.bluecheetahlax.com/