Sprinter James Dasaolu aims to prove UK Athletics head coach Charles van Commenee is wrong about his fitness at this weekend's Olympic trials in Birmingham.
Earlier this month Van Commenee claimed the 24-year-old was fragile and an athlete who "gets injured when they step out of bed for no reason".
Dasaolu has had his problems - ranging from foot stress fracture to torn hamstrings twice - but insists a change of coach and a new training regime means he can put those issues behind him.
"I am fit, healthy and raring and ready to go and I am ready to compete this weekend," said the 100 metre runner, who is now working under the guidance of Kevin Tyler, UKA's head of coaching.
"I believe I am now over the problems. It is Olympic year, the year that matters most, and I do believe those [difficult] years are behind me.
"My biggest change was moving coach in January this year. It meant a different approach to training and it has really benefited me a lot.
"There is more focus on the running aspect and acceleration and I've spent less time in the gym and more time on the track.
"I have started a new programme and I believe that has allowed me to stay fit and healthy and produce quick times."
That has been backed up on the track as Dasaolu is only one of two athletes to run the Olympic A standard of 10.18 seconds, which he achieved at Montgeron in France in mid-May.
The only other person to achieve that is 18-year-old Adam Gemili, who has posted 10.08secs to make him the second fastest European this year after France's Christophe Lemaitre.
At the Aviva 2012 trials, which begin on Friday, the top two sprinters will secure their places for the Olympics - provided they have achieved the qualifying standard - with another spot awarded at the selectors' discretion.
With Dwain Chambers - seeking selection after the British Olympic Association's ban on doping offenders was overturned - Tyrone Edgar and Harry Aikines-Aryeetey all likely to line-up at the Alexander Stadium competition will be tough.
"I expect people to run their best and if that means going under the Olympic qualifying standard then so be it - I can't take any of my rivals lightly," added Dasaolu, who grew up in Croydon and would love nothing more than to go to an Olympics in his home city.
"Dwain is a quality athlete and I expect him to bring his best come the day of the trials. No-one is to be under-estimated at all.
"Adam is very talented and he has run 10:08 so all eyes will be on him and how he can perform against the senior athletes.
"I don't have any times in mind. My main goal is to qualify for the Olympics, which means performing at the trials.
"Everyone knows this is their moment to shine and I am sure everyone is hoping to thrive under this pressure because it is a big thing to make the GB team."