There are plenty of opportunities to work on your arm (and other things) during the winter in Minnesota. Some examples that my 2016 can participate in are;
- twice a week long toss program during the fall until the snow flies (HS)
- weekly workouts at a local dome(HS), covers hitting, fielding, and long toss.
- biweekly workout at a local dome; same as above but put on by the local sports org.
- focused training put out by a local college - specialist catcher, infield, pitcher, or hitting training - including position specific lifting (commercial).
- pitch, hit, catch. A weekly come and sign up opportunity to pitch a couple of innings to live batters. You can pitch, catch, or hit, or all three. Great place to work on new pitches.
- go outside and long toss. Hey, it may be cold, and it may have snow, but there are plenty of days during the winter when it's sunny, not too much wind, and it's above 10F. Wear appropriate layers, find a plowed parking lot, and go out and long toss.
- get you and your buddies to pitch in and rent some time at the Metrodome. It's $500/hr (less before 6am) and you'll have a MLB ball park to play baseball in.
- go to the YMCA and throw baseballs at the concrete wall. Mark out a strike zone with duct tape and have at it.
- sign up to train at one of the specialist baseball facilities (there are many outside of the Twin Cities metro area). Most have a field house large enough to do long toss (well 120-150ft anyway).
So, stop making excuses and go out and train.