Dhaka, Sept. 4 -- Weighted vests are becoming a popular accessory in gyms and on jogging tracks, promoted as tools to strengthen bones, boost performance and even accelerate weight loss. But fitness experts caution that while they can be useful, the benefits may be overstated.

The vests, which add resistance through removable weights, can make everyday exercises more challenging without altering routines. "People start to realize how good it feels to work just a little bit harder and smarter," said Jessie Syfko of Life Time gyms.

Research suggests that for healthy adults, adding about 10% of body weight to a vest may improve agility, speed and athletic performance. However, studies show limited effects on weight loss or bone density, es...