Practice snap shooting if you think you're fast enough to be a frontman. Have your friend who's a little heavy practice laning/posting. A good player will be able to hit a very small target. This is important since a good player can also make himself a small target. If you're up against someone who's good, there aren't going to be easy shots. Take a standard vl200 hopper and stick it behind say a sheet of plywood or something. Have a small portion of it protruding. Do the same with an old mask or a pipe (simulating a barrel). Hide behind something that's around 40-50 feet away from the sheet of plywood. Practice leaning out of it and snapping off a couple rounds. Get good enough so you can come out and hit the object with 1-3 shots. Any more and you're out of the bunker too long.
Your friend can practice posting by setting up two sheets of plywood next to each other with a 6-7 foot gap between them. Have a small object such as a mask or hopper again tied to a peice of string. Have a teammate sit behind one of the sheets and yank the object back and forth. The backplayer needs to be able to hit the object moving between the bunkers. Have the guy behind the plywood try his hardest to move the object without it getting hit.
Other than that, just show the team you're trying out for that you can communicate a lot and effectively and that you can stay on top of things. Ie, moving when you need to move and shooting when you need to shoot.
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