Steven Davis praised the sports science team at Rangers for ensuring there was no lockdown lethargy among the Gers players.
Celtic were crowned Premiership champions for the ninth time in a row in May after the campaign was cut short in March due to the coronavirus.
Steven Gerrard's side must now try to prevent their Old Firm rivals winning a record-breaking 10th successive title while also aiming to bring a cup or two back to Ibrox.
Davis was impressed with the fitness programmes handed out by head of performance Jordan Milsom and his staff before the squad all reported back for pre-season training.
The 35-year-old Northern Ireland midfielder said: "Straight from the off, the sports science team gave us individual programmes to try to keep ourselves ticking over.
"To begin with, we weren't sure what was going to happen with the league, and then once the decision was made on that, they updated the programmes every couple of weeks to keep us fresh.
"We are very fortunate that we have a great medical team and sports science team.
"We have all the information we need to try and get us in the best possible shape, and in terms of recovery as well. So it is important to try to do as much as possible to get yourself firstly in the best physical shape and then secondly in terms of recovery and nutrition as well."
This week, Rangers will be facing both Lyon and Nice in the Groupama Stadium in the Trophee Veolia. It will be the first time Davis will have returned to the ground since Euro 2016 when Northern Ireland won 2-0 against Ukraine.
He said: "It was a great day for us after the disappointment of the first game (losing 1-0 to Poland) where we didn't really feel we put in a performance that showed our real qualities.
"To then go to Lyon and to beat Ukraine let us qualify for the next stage, so great memories from there, and we were based in Lyon as well so it will be nice to go back there."
Meanwhile, Rangers' Premiership clash with St Mirren at Ibrox has been moved due to the Gers' Europa League commitments.
The Light Blues will welcome Jim Goodwin's side to Govan on Sunday, August 9 with a 3pm kick-off, 24 hours later than originally scheduled.
The fixture amendment is due to the Gers' last-16 tie away to Bayer Leverkusen on Thursday, August 6.
They trail 3-1 from the first leg in March.