Day 2 and 3 in Gym

I had made 3 trips to gym since last week. Yes, not bad and spirit is still strong. For the 2nd and 3rd trip, I ran a little bit further, i.e. 2 km in 20 mins. I kept my speed at 6 and that's the furthest I can go. Next trip, I should either increase the speed or run 30 mins.
Lucas, my mentor, has been keeping track of the distant. Each time I come back from gym, he will ask.
Lucas: Mom, how far did you run today?
Me: 2 km.
Lucas: But you said you will run more than 2km.
Me: 2km is the best I can do.
Lucas: Are you going to run further next time?
Me: I'll try.

I did another exercise on a step machine. Was told it is good for my butt. And I still do the weight lift for my legs (increase to 3kg) and arms (still at 2 kg).