Exercise is key to healthy aging, and 30-second sessions of squats and push-ups may be enough to build strength and help you live longer, a doctor said.

Exercise is key to healthy aging, and 30-second sessions of squats and push-ups may be enough to build strength and help you live longer, a doctor said.

Research has recently found that taking up weight training can significantly boost your chance of longevity - and you don't even need to do that much of it to make a difference.