Cummings sustained an arm fracture in Glasgow's Champions Cup meeting with Harlequins in January, keaving him in a race against time to be fit for Lions selection, but he made his return for Warriors off the bench two weeks ago in the URC defeat to Bulls and was one of eight Scots named in Andy Farrell's 38-man squad for the tour to Australia.
"Injuries happen, there's nothing you can do about it," Cummings told BBC Scotland.
"I was just trying my best to get back fit as quickly as I could. I had a couple of setbacks and injuries so it ended up taking me a bit longer than I'd hoped.
"I did think that might have been any chance of me getting on the tour gone, but thankfully I got back to fitness in time.
"I believe it's the pinnacle of the sport for us. It's something that brings countries together. You go on this special tour and I've got great memories of getting up early and watching the 2013 tour in Australia when I was still school.
"These are moments that you dream of as a kid but you never know if you're going to make it there. To achieve that has been something special."