Paralympian sprinter Jarryd Wallace’s biomechanics are analyzed at the Southern Methodist University Performance Laboratory in Dallas,Texas. Robert Clark/National Geographic

Have Elite Athletes Hit Their Peak?

When athletes break a world record, it’s usually by a fraction of a second or a quarter of an inch. So how much further can we push ourselves? USA Today sports columnist Christine Brennan joins guest host Courtney Collins to talk about how scientists and coaches are working to squeeze every last bit out of our potential. Her story “Building a Better Athlete” appears in the July issue of National Geographic magazine.