Manchester United defender Harry Maguire says returning to training this week felt "so safe".
The Premier League side are among those to begin training in small groups this week as part of Project Restart.
United's vice-chair Ed Woodward told investors on Thursday that he expects the Premier League to resume in June, although he could not specify when.
Maguire was asked by United's website if he felt reassured that mass testing had begun across the English top flight.
"Yeah, it's been a strange few months, but it has been a protocol which the club has followed. It seems such a safe environment.
"It's our first day back today, but it seems so safe and everyone is respecting it so well, so long may that continue and I'm sure no one will have any problems.
"There is a lot less people at the training ground when we go in. Today I was in a group of four, working with one coach, so not many people.
"You've got a lot space, big areas, not going really close to anyone, but the main thing is getting the work in and it was a tough session, [then] go home and now I'm relaxed and it's all in the bank and I'm looking forward to tomorrow."
In the first 748 tests conducted on players and club staff, just six have returned positive.
However, some players like Watford captain Troy Deeney and Chelsea midfielder Ngolo Kante have opted against returning to training on health grounds.
But Maguire had no qualms about his return, "Yeah, there's slots all the way throughout the day, so some people will be in in the afternoon.
"I feel sorry for the boys who are doing the afternoon today with the weather, so I'm sure it will be tough running out there.
"There's slots, I think every 30 minutes we have a different slot and each slot is taken by a different coach at the club.
"It's obviously strange and something that we're not used to, but at the moment it's just getting the base fitness, the physical fitness and I think it's good mentally as well to come into the training ground and get used to the surroundings again."