it depends. I strongly suggest you dont do plyos in season, but it is possible to do strength training. I dont do strength trainging for legs because we already run alot and im always sore, but if your team doesnt do run much go ahead and do some strength training 2X per week. It is very hard to gain on your vert during the season. You need to have genitically fast recovering muscles that you cant control, so it all depends on the person.