Why are some able to get fit and stay fit while others struggle to do so? As life coach Tony Robbins says, "Success leaves clues." The following are those clues -- behaviors, characteristics and strategies top fitness authorities say their most successful clients routinely practice and exhibit.

Take a look at how a few of the best minds of the past and present approach fitness and nutrition, and you'll find everything from deep commitment to physical excellence to quirky eccentricities and possibly some familiar complaints.

Metabolic training fuses whole body strength, cardio, power, endurance, and mobility work all into one, providing the modern, over-scheduled trainee with the ability to burn fat, build muscle, and boost metabolism in 30 minutes or less. These 16 awesome afterburners deliver everything you need for total fitness.

If you hate push-ups, these seven upper-body exercises aren't only great alternative, they're also a great addition to any workout routine. Mix up your workout routine with these incredibly effective moves.

Can't make it to the gym? Have no fear: Your chair workout is here! With these 15 exercises, you can work out from the comfort of your own home.Say goodbye to those excuses not to work out -- and get ready to sweat.