Tuesday 19 January 2016 19:03, UK
Jessica Ennis-Hill is an athlete who strikes fear in the heart of her fellow competitors, according to former Olympic gold medallist Denise Lewis.
Ennis-Hill made a stunning return to action in 2015 by winning gold at the Beijing World Championships, just 13 months after giving birth to her son Reggie.
And Lewis, who claimed heptathlon gold at the 2000 Olympics in Sydney, admits Ennis-Hill is in the box seat to retain her Olympic title in Rio later this year.
"Jess was phenomenal last year and I think she answered a lot of questions for herself," Lewis told Sky Sports.
"To come back from a baby break and take that competition by the scruff of the neck just shows the status and the calibre of athlete you're dealing with.
"Even when she is not in the best shape she is still good enough and if I was still there competing against someone like that I would be very fearful.
"She is so disciplined. Now she has got another winter behind her as we look forward towards Rio and she has got to be the favourite."
It was a year of contrasting fortunes for Olympic hopeful Katarina Johnson-Thompson, who began 2015 in fine style by breaking the British indoor long jump record before winning pentathlon gold at the European Indoor Championships.
But the 23-year-old's hopes of a World Championships medal were dashed when she failed to record a distance in the long jump after all three of her efforts were deemed illegal.
"Hopefully Katarina has learnt a lot from 2015," Lewis said.
"She was in fantastic form in the indoors and was pretty formidable in taking that pentathlon title. One would have hoped that would be the springboard to the outdoor season but it didn't quite go that way.
"We have to remember that she is still learning and there are perhaps some things she needs to adjust in her training but you cannot deny her talent.
"She's very young still and nobody becomes a seasoned medallist without having a few disappointments and a few setbacks. Jess has had them but you learn from it and that will really be the test for Kat in terms of how she learned from last year.
"She will give Jess some sleepless nights in the future because she is that good. She has so much potential but she still has to prove herself."
Great Britain are blessed with quality in the heptathlon with teenager Morgan Lake - winner of the SportsAid One-to-Watch award 13 months ago - also coming through after winning two gold medals at the 2014 World Junior Championships in Oregon.
"She has a lot of potential but she is still so young," added two-time Commonwealth champion Lewis.
"It's hard to make predictions about which way she'll go because she is such a talented high jumper as well. But she knows where her strengths lie and she still has a lot of development ahead before anybody can cast a real critical eye over her.
"But she is a different kind of competitor to Katarina and Jess so we'll have to see how she develops."
