Scientists in Loughborough are developing a new exercise regime which could reduce the chance of broken bones in older people.
The aim is to see if hopping and more exercise can improve bone density and so prevent osteoporosis.
The research team at Loughborough University has teamed up with medics from the Leicester Royal Infirmary for this hop test and still need more volunteers.
Around £3 million people in the UK have osteoporosis brittle bones and every year more than 230,000 fractures occur because of it.
One in two women and one in five men over the age of 50 will have a fracture mainly as a result of the condition.
BBC Leicester's Rob Sissons met volunteer Allan Woods, who signed up after a personal experience.