Yoga is a discipline including breathing control, simple meditation, and the adoption of specific bodily postures used for health and relaxation.
Yoga makes great improvements on balance and flexibility more then other genres of fitness. It is more of a relaxing style of fitness that can improve sleep and heart health.
Yoga requires a lot of focus, this means not getting distracted from your surroundings. Flexibility is a key component to yoga. For those that lack flexibility will find it challenging to perform.