I was like you and was gasping for air and it was hard work right from day 1. I kept at it and just ran my first 5K on Saturday!
I did the app 3x week and and did better giving my body at least one day of rest in between runs. And later on I think I repeated week 6 and 7. I'm 44.
Good luck! You can do this!
You can do this! I am 44 and have NEVER been a runner. I got off the couch in July and started this program. The first day I made it through the first half of the run/walk and wasn't sure I could finish I was so tired. I did finish! And kept at it. This past Saturday I ran my first 5K! You can, too!