Ollie Norwood insists the players are working hard at home, despite Covid-19 seeing United's Shirecliffe training based closed for the foreseeable future.
The former Northern Ireland international has revealed each individual has to submit video evidence of their sessions, despite the Premier League being suspended until the end of April at the earliest.
Norwood remarked: "We were sent back home with programmes, heart-rate monitors, watt bikes, treadmills and basically we have to check-in three times a day.
"All the stuff is recorded on your mobile, you set it all up, it goes straight to the fitness coach and if you don't do a session, it's a fine. So everybody's doing it at the moment.
And the 28-year-old is sure all his team-mates will comply with the rules of training from home.
He added: "I don't know how long this continues, but we are only three days in, so you know what it's going to be like, in 10-15 days, the lads will have had enough of the sight of four walls.
"But it's quite a hefty fine if you don't so you are probably better off doing it to be honest."