David Moyes has warned West Ham's under-performing players to shape up or ship out.
Moyes has already overseen two gruelling training sessions since he was appointed manager of the Premier League strugglers on Tuesday.
Questions were raised about the fitness levels of the squad under previous manager Slaven Bilic, with damning statistics showing they were bottom of the class when it came to sprints and distance covered.
But Moyes, who is in talks to bring in no-nonsense former Hammers defender Stuart Pearce as part of his coaching staff, says there will be no easing up on his watch.
"If you are asking me where my best attribute is, it's out on the grass training with players, but we need the players to show it," he said.
"Once they know they are running the least and sprinting the least they need to take responsibility.
"The sessions will be tough for them but hopefully they will enjoy it too. We are working them hard and trying to get the best we can out of them.
"If anything they are anxious to show the new manager what they can do. But there will be no favours, if they don't do the running they won't play.
"Step it up or you won't play, if you don't run you won't play. I'm in a hurry and they need to be in a hurry too."
Moyes is indeed in a hurry to make his mark having only signed an initial contract until the end of the season, with a brief to lift the Hammers away from relegation trouble.
West Ham are banking on the manager who enjoyed 11 successful years at Everton rather than the one who looked lost at Manchester United, struggled at Real Sociedad and last season took Sunderland down from the top flight.
"It's good for us both," added the 54-year-old Scot.
"It's good for me because I'm back in, it's what I do and want to do well. I think it's good for West Ham as well, they've got a good manager.
"Managers aren't now having long-term contracts so I'm more than comfortable. If I'd taken over at the start of season I'd have said a year at the time.
"It gives me a chance to see the east end of London, to see the players, and let West Ham see what David Moyes can do.
"My ambition at the moment is only short term, I have to win games, get us away from the wrong end of the table - and the squad is good enough.
"I do have a point to prove. Sometimes you have to repair things and maybe I've got a little bit to repair."