The benefits of yoga are enormous and if nothing else at least you are guaranteed a good way to achieve mental peace and learn a new way to exercise. But you have to remember that almost all types of yoga also emphasize a few similar things like,

• A Healthy Diet of fresh leafy vegetables and fruits to increase you health and decrease the junk food intake you have.
• Asanas or postures to train the body and make it more limber and reduce joint aches.
• Sun Salutations
• Pranayama to control breathing and to train the mind for meditation.

The best alternative for a busy person will be to learn the basics and then do a minimum of a half hour of meditation and yoga in the security of your house.