If you are still on the couch about getting in shape, say you don’t have time, well here it is!
A study done this year, shows an inactive group had great increases in health by doing High Intensity Interval Training 4 minutes per day / 3 days per week. 12 Minutes total per week!

“Body fat, total cholesterol, LDL-cholesterol, and ox-LDL cholesterol only were significantly reduced after 4-AIT. Our data suggest that a single bout of AIT performed three times per week may be a time-efficient strategy to improve VO2max and reduce blood pressure and fasting glucose in previously inactive but otherwise healthy middle-aged individuals.”

Everybody simply exercised at 90% of their maximum heart rate for 4 minutes.
This is awesome for those that are just starting out!
Running, Biking, Spinning, Swimming… find what you like and go do it.