Here are some bodyweight exercises that can help strengthen your wrists for arm wrestling:

1. Wrist Curls: Sit on a chair or bench with your forearm resting on your thigh, palm facing up. Hold a dumbbell or any weighted object in your hand. Slowly curl your wrist upward, bringing the weight towards your forearm. Lower it back down and repeat for several reps. You can also perform this exercise with a resistance band if you don’t have weights.

2. Reverse Wrist Curls: Similar to wrist curls, sit with your forearm resting on your thigh, palm facing down this time. Hold a dumbbell or weighted object and curl your wrist upward, bringing the weight towards your forearm. Lower it back down and repeat for several reps.

3. Wrist Push-Ups: Start in a push-up position with your hands flat on the ground, fingers pointing forward. Instead of bending your elbows, focus on bending your wrists, lowering your body towards the ground. Push back up and repeat for several reps. This exercise targets the muscles in your wrists and forearms.

4. Finger Push-Ups: Similar to regular push-ups, start in a push-up position with your hands flat on the ground. However, instead of placing your palms flat, lift your fingers off the ground, keeping only your fingertips in contact with the floor. Lower your body towards the ground by bending your wrists, then push back up. This exercise helps strengthen the muscles in your fingers and wrists.

5. Hand Grippers: Hand grippers are small, portable devices that you can squeeze to strengthen your grip and forearm muscles. Squeeze the gripper as hard as you can and hold for a few seconds before releasing. Repeat for several reps.

Remember to start with lighter weights or resistance and gradually increase as your wrists become stronger. It’s also important to warm up your wrists before exercising and to listen to your body, avoiding any exercises that cause pain or discomfort.