Motivationally challenged

So my once active lifestyle has slowed to screeching halt. Sure I chase a bunch of kids around but my intentional activity output is literally nonexistent. Yesterday I jumped at the chance to take the kids for a bike ride and decided to roller-blade along with them. I know that most people haven't roller-bladed since the '90's but if I remember right it is actually quite fun. I will not tell you how old these skates are but the truth here is evident. The kids hopped on their bikes and I donned my skates and off we went... Within two blocks my legs were on FIRE. Am I really that out of shape? Seriously, this is pathetic, I could barely move, I was having to suck up my pride every time one of my neighbors drove past, I was moving in slow motion. I once did a rollerblade "marathon" through Disney world, 26 miles, with a smile on my face, but now I was feeling ridiculously old and pathetic. And then I looked down and realized that my "oldish" skate wheels were melting into the summer scorched blacktop pavement. I was instantly thrilled! Maybe, just maybe I am not as shamefully out of shape as I thought, maybe I just need some new skate wheels and all will be right with the world... Come on kids, bike rides over! I need to get myself a new dose of motivation.. this didn't help.