Tony watched Steve move as he worked on a punching bag, he made it look easy the way he circled and struck out at it before he was turning around to face him. "Well you know how it is," Tony said like he was capable of being entirely casual around any Steve Rogers in the multiverse. "You start showing a new friend around and you've gotta come and see all the sights." Maybe Steve was a sight, who was Tony kidding, he absolutely was a sight, but you know the gym was a good cover.
And then Steve asked about sparring and he shrugged, "Maybe," He admitted he hadn't considered it until now, but then the idea of sparring with Steve kind of appealed to him a bit. "Have there been a lot of takers so far?"
They probably needed something like this, a place to blow off some steam and keep in shape - considering the majority of them were heroes of some sort being able to keep up that kind of active lifestyle was important even if they were living life at a more sedate pace than they had been in the past.