There's a new fitness trend draped over many shoulders. If you've taken a walk lately, you've likely noticed people wearing weighted vests.

The market for weighted vests is expected to grow to more than $300 million over the next few years.

The Mill City Rucking Crew works with weighted backpacks.

"I would probably describe it as walking with weight on your back," Evelyn Keaton, a rucker said.

For Nicole Keaton, who rucks between 20 and 30 pounds, it's a strength thing.

"I am aging and my body is changing. It helps keep me grounded," Nicole Keaton said.

Weighted workouts have been standard in the military for generations. Now, thanks to weighted vests, they are more popular than ever.

"You've seen both rucking and weighted vests in GQ and Men's Health, so I think it's found these ap

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