We use to do punching and knee/leg movement exercises in water for more all around resistance. Just as hard to bring the arm/leg back to the starting position in water, so double the resistance. Seem to work better in the ocean, rather than a swimming pool, because of the heavier water. In the ocean you also have to be concerned with body balance, never ending waves and all. Never had my self but some guy's have done punching, etc in downstream rivers. More total balance required. Any way you do it, a great workout and cardio booster. Of course, running in water is great football training for anyone. Or even loose sand. All cardio.
To some guy's here I might explain to keep the head above water while doing any of this. Not that anyone here might be considered stupid. But judging from some of the recent post, you got to wonder. Good Luck
SideBar: had a distance cousin in NZ, a Pro boxer, who did water resistance as part of his training.