I use a heavy hammer for forearm work (pronation and supination) for tennis and other racquet athletes. I use paper towels for quickness and reaction drills (and to improve their hand-eye coordination) for both my athletes as well as my elderly clients. I use tennis balls for just about everyone (suicides, shoulder stabilization, balance drills).
I hope this helps.
We have a lot of fun with balloons:
Partner drill where you hit it back and forth on 1 foot. (Get 1 point when your partner’s foot touches down.
Big circle where you hit the ball from person to person. Whoever hits the ball changes the exercise we are doing (squats, knee lifts, hamstring curls). Start with one balloon, then add more.
Plank drills where partners try to stay in a plank and hit it back and forth (got this one from an IDEA article, think it was Rodney Corn).
No matter what there is plenty of laughing and it is always a great class.
Battling ropes! I think they provide a great full-body workout, burn a lot of calories and improve the overall physical condition. There are many different ways they can be used and they are safe and injury-free equipment. I use them in all of my classes and my clients love them.
I also like chains, sandbags, glides, tires, backpacks (full of books or weights) and weighted vests.