The noun impairment means that some ability is not as strong as normal. People can be:
An impairment can also be temporary - your judgment and coordination become impaired when you drink too much alcohol, for example.
Both disability and handicap refer to a problem that prevents someone from doing normal or typical activities. People who have such problems are sometimes described as disabled or handicapped people, although the best term is to say someone has a disability or, when talking about these people as a group, to say people with disabilities.
When a building or other structure has special accommodations for people who use wheelchairs or who have other mobility difficulties, we often call these handicap-accessible places.
There are many strategies to the game of Goalball. You can throw the ball hard and fast, or soft and slow. You can throw the ball cross court form corner to corner, or even curve it by placing a spin on the ball before releasing it. These techniques all have advantages and disadvantages which always leaves new things to master the game and makes it both interesting and fun to play.