Dame Jessica Ennis-Hill says she could have been an even better athlete if she had trained around her periods.

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Nearly 10 years after winning gold in the heptathlon, at the London Olympics, the mother-of-two is launching Jennis, a menstrual-cycle mapping app.

It aims to tell users how to use their hormones to their advantage by exercising in different ways at different times of the month.

But experts say everyone experiences their menstrual cycle differently.

'Gold-medal moment'
Dame Jessica remembers starting her period in the middle of the heptathlon at the Junior European Championships in Lithuania, in 2005.

"I was so preoccupied and worried that anyone was going to see that I started my period and that I didn't have the right protection to sort myself out," she said.

"I remember just running that 800m thinking I'm trying to run for a gold medal here but I'm also very aware that I've just started my period.

"I just rushed off the track and felt that I couldn't absorb that amazing, gold-medal moment.

'Being aware'
With so many factors that can influence menstruation - from stress and obesity to polycystic ovaries - Ms McNulty warned against "one-size-fits-all" advice.

"Women are on a spectrum," she said.

"Some won't get much benefit or notice any differences and some will notice massive differences in their performance and training.

"So it's about being aware of your own individual physiology."