Nobody likes getting older. One of the biggest reasons why is because our muscles become weaker, making the activities we used to enjoy more difficult to do...and less enjoyable.

But what if you didn't have to get weaker as you got older? What if you could actually become stronger?

Celebrity fitness trainer Tony Horton says he's found a way to turn the impossible into a reality - his reality, which he is now using to help thousands of Americans remain healthy and active as they hit middle age and beyond.

"It's actually a lot simpler than you might think," Horton, who is 61, told us. "It's a method anyone can do that takes about one or two minutes a day. And within a very short period of time, you're going to feel stronger, and probably healthier, than you have in years."

Almost everyone begins experiencing some degree of age-related muscle loss starting between ages 40-50 (the scientific term for this phenomenon is sarcopenia).

It's perfectly natural and nothing to worry about; however, it can make it harder to exercise or even perform routine activities you take for granted - like playing with kids or pets, or carrying groceries.

On average, people lose about 0.5%-1% of muscle mass each year. While that may sound minor, it can add up over years and decades. Increased frailty is a big reason why elderly people are more prone to falling down, which can lead to prolonged bed rest or hospital stays, which can mean even more muscle loss, in what becomes a vicious downward spiral.

Health experts have long believed age-related muscle loss is simply an inevitable aspect of getting older, with the only way to slow it down being to increase dietary protein and do more exercise.

But Tony Horton says he's found a much more effective way to fight age-related muscle loss - and even build new muscle - that has nothing to do with exercise.

"This came as quite a shock to me, because I'm the biggest workout guy on the planet," said the man who has trained Bruce Springsteen, Tom Petty and Stevie Nicks, to name a few of his celebrity clients.

"But the results are undeniable. Using my method, it is now possible to, at the very least, slow down age-related muscle loss. Best case scenario, you actually have a chance to get into the best shape of your life.

"And it couldn't be easier to do!" he laughs.

In fact, the results have been so remarkable, Horton is now the subject of a short documentary detailing exactly how his body-strengthening method works. It is online and free for the public to view and share.

The video has since gone viral, first being shared by users on Facebook, then being featured on news sites like ABC and CBS.

So far, the comments and feedback have been outstanding, with thousands of Americans claiming they feel stronger than they have in years.

"I never would have believed I could feel like I did 10 or 20 years ago if I didn't actually try Tony's method," one viewer wrote.

"I'm swimming again and my body feels GOOD!" raved another. "This really WORKS!!"

Horton does make a simple request of those people who watch the documentary: "If watching this helps you build more muscle, get your body back and feel stronger, and even get more energy and confidence," Horton says, "Then please share this video with your friends and loved ones. Together, we can help as many people avoid age-related muscle loss as possible."

Click here to watch the presentation

*individual results may vary.