It is just not fair how your mind tells you to do things or gives you this desire to do things and your body decides to create aches and pains and lack of ability to do those things!
I'm 61 years old and have arthritis and my mind says I'm still in my 20's and is filled with creative ideas for projects and activities but my body aches and hurts and slows me down. 
One of the many blessings of having a cute hyper dog is that he urges me to get up and dressed and out the door for walks.  I have to thank him for that!   I've applied the app to my iPhone that keeps track of these walks & activities and giving myself a goal to walk at least three times a week plus other exercises.   This app. is also streamed into my computer so it's right there........right there on my screen to stare me in the face telling me that I have to do it!  
I guess there are benefits to these high maintenance confusing technical gadgets after all.