I love soccer!! I played in high school. I remember the following being a huge part of practices:
- speed/interval workouts (google "suicides"- this was a big one, or sprint intervals where you have to jog until the coach blows the whistle and then sprint, then jog again when he blows the whistle, etc)
- agility workouts: setting up cones close together and running between them, which requires quick darting back and forth, building up tendons and moving muscles in different planes than they the regular front-to-back they are used to
- QUAD STRENGTHENING. gotta have those quads for massive boots down field
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- And of course, lower body strengthening in general (squats! lunges!). We did 2 practices each week in the weight room.