Physical fitness is the ability to function effectively throughout your workday, perform your usual other activities and still have enough energy left over to handle any extra stresses or emergencies which may arise.

The P90X workout program (http://www.90DayWorkoutPlan.com) by Beachbody and Tony Horton has recently been used by ....

The title tells the wiki meaning of P90X. In an elaborated form it is home exercise including rigorous interval training. Its main aim is not only to lose weight but to maintain a good shape.