Weight belts can help reduce injury when weight lifting, because of the assistance they provide with balance.
Test your maximum to make it seem easier. Take a few seconds to lift a weight you know you cannot handle yet. When you lift it, have a spotter, and set it down immediately. Afterwards, work out using the weight you had originally planned on, and it will feel much less cumbersome!
Wear the proper shoes for your sport. To prevent injury, instead of just throwing on your cross-trainers for every activity, invest in shoes made specifically for each sport. Sport-specific shoes are designed to support your body for the types of movements made in the sport. For example, forward movement and cushioning for running or side-to-side and ankle support for tennis.