OK Cheetah, that's good to know you're looking for mostly 2's. I think the cardio and core and scrimmage is excellent for that - jogging, situps/crunches/core. The ball is suppossed to be really good for core. The Pat Powers beach clinic is good also, although they focus mostly on the passing, less on hitting and setting (he says he's not a setter
I think military press, bench, and dips are good for getting a sometimes water soaked ball over the net in beach 2's (especially good to fall back on strength when you're catching your breath after a long rally.) Bench press, military press and flies really make a big difference with hitting and serving for consistency plus power. Plus anything for your lower legs. Running up bleachers is great. Suicides in the sand are great for cardio, speed, etc. I like jogging light hills plus a stepper for the lower legs strength and stamina, but a lot of people say the stepper is bad for the knees. Shadow blocks are good too. My dining room has tall ceilings - I jump up against the wall and see how high I can touch. It's important to jump again right after you've landed. I jump up stairs too, take one at first, try to work up to 2 or three at a time...make sure you jump with both feet (imagine your ankles tied together.)
Outside the workout stuff, 2's requires a lot of good communication. I like to play with people that talk a lot on the court - tell me where they are, etc. I am also fortunate to be able to play in a men's 2's & 3's league in the sand on a men's height net, so when I get to women's grass doubles - the net is lower, you can jump more easily, digging the hits is not as hard, etc.
The final thing 'to work' is your mental toughness - 2's is a head game like golf - you have to play often or else do something else that tests and develops your confidence and mental toughness and determination...oh yeah, remember to keep it fresh and have fun to stay motivated throughout the season (sometimes I go in with a goal of winning so many games or such and such record at a scrimmage or pool play in a tourney and then measure my results - it can be encouraging or give me a good kick in the b*& when I need it!)
