According to TSSAA, you can't start practice before some time in, I think, July. I don't know if they consider "workouts" different from practice, and I don't know if they enforce their own rule consistently. I did see one team fined last year for practicing before July--forget who it was. I would guess that if workouts are limited to training, fitness, weights, cardio, etc, that it is not considered practice and could then start earlier. Don't know if that's a fact or not.