Got to incorporate some sort of weight training into the week regardless of what it is. Hitting the floor with push ups, dips, pilate, stretch routines, elastic bands when at home and going to the gym for plyometrics, free weights or machines .
For me, adding strenght conditioning routine of any sorts works well, keeping me injury free and maintains my endurance.
Yes, there will be days I would do heavier weights and some days I would do lighter weights with higher reps.
It does takes time for your body to get sore due to the added routine ... you'll get sore but you know its a good sore.
As you know by now, you got suggestions coming at you on every direction. Just pick up the basics and see how your body and your game reacts to it.
You may get just get surprised!