Is grunting a sign that we’re ageing fast? Or is it just one of those things that come with the middle years, like reading glasses, greying hair and 'dad jokes'?
It probably sounds bad or uncomfortable to you. But stiffness is part of what gives elite athletes the spring in their muscles.
Women and adolescent girls say that being outdoors in nature offers opportunities to gain confidence in physical activity.
Kids' fitness has declined for several decades, but kids in rich countries are showing improvement. What does this suggest for kids in poor countries?
Drinking coffee before exercising could make you run faster and lift heavier - if you've the right genes.
Physical activity is considered an important way to lower risk for breast cancer. But what if your ability to be fit is influenced by genes you inherit? Would that raise your risk? In rats, it did.