Crawford was singled out for special praise by new Light Blues sports science supremo Jim Henry after he was appointed in the summer.
The 20-year-old midfielder took former Celtic, Aston Villa and Sunderland fitness guru Henry aback during pre- season training.
Henry enthused: "Robbie is aerobically the best I have ever seen - and that's out of over a thousand players I've worked with."
Crawford is a former Scottish Schools Cross Country running champion and took part in a 10k at Bellahouston Park in the summer.
And he is no slouch when it comes to the beautiful game either as he has shown in his performances so far in the 2013-14 campaign.
He has played in all six of the Govan club's competitive matches so far and netted his first goal of the season in the 6-0 win over Airdrieonians last Friday night.
As he prepared to face East Fife at Ibrox today, Crawford admits he has taking a ribbing from his team-mates about Henry's plaudits.
"Some of the players did comment on it!" he laughed. "But when you train with somebody day-in, day-out you know what they are all about.
"Your fitness, how you take care of your body, is something that you can control. I do try to work hard on that aspect.
"But it is my intention to show everyone this season that I am not just an athlete but that I can also play a bit as well.
"I have a lot to prove to people here. Rangers is a big club. I work as hard as I can every day and try to get better and better as a player.
"Getting into the first team and playing so many games last season was obviously a great experience. Hopefully, I will progress further this season."
Crawford added: "It was good to score against Airdrie. Creating chances and scoring goals is what it is all about. We are looking forward to every game that we play now.
"I have had chances in the other games and didn't take them. It was really pleasing, and a bit of a relief as well, to finally take one.
"I got a good pre-season under my belt and have focused on proving myself. I would love to be involved reguilarly from now on."
The SPFL League One game against East Fife this afternoon is the last time manager Ally McCoist will be able to field just two of his new recruits.
From September 1 he will be able to play all eight of the free agents he brought to the Gers during the summer.
That will limit the number of first team opportunities that youngsters such as Fraser Aird, Crawford and Kyle McAusland have in the months ahead.
However, Crawford reckons that training and playing in games with experienced professionals like Jon Daly and Nicky Law will improve them as players.
And he is hopeful they can challenge in both the Ramsdens Cup and the Scottish Cup as well as the league with a far stronger squad of players.
He said: "It is only going to help us playing with these guys. Jon is certainly always there to talk to and is always good to bounce ideas off.
"We have got a really good mix of experienced players and young boys at the club this season and hopefully we can go on and do well.
"When you are at a club like Rangers you know that there is always going to be competition for places. Nobody has a right to start a game.
"We expected new players to arrive at Rangers in the summer and that is exactly what has happened. But we were all pleased to see the new lads come in.
"The squad got a bitstretched at times last season when we picked up injuries and suspensions. Hopefully, it will help us perform far more consistently.
"We have produced a few good displays so far.
"Having more players in has created increased competition for places and should result in us performing far better than we did at times last season.
"I am looking forward to the challenge of trying to force my way into the team this season."