I am 80 and try to do what exercise I can, but with a bad back, I am limited to what I am able to do each day, and have to see what I can manage on that day. so my best thing is going swimming. It is easier to do exercises in the water and less painful to try and stand more erect and try to raise my arms above my head and drop down in the deep end after about 4 lengths to straighten myself out more. I try to do some walking whenever I can and at this time of year, I try to go out whenever it is dry and a little sun. Housework can wait, the weather wont! I also use my love of music on radio three to have some more enjoyable exercise. Whatever I am doing if there is a vienniese walz or a quickstep or a quick march, I drop whatever I am doing (not literally of course!) and then either dance or march around the flat in time to the music. It is a bit of fun, more enjoyable than a set exercise , and even if I need to have a hand on the back of a chair a bit of on the spot marching, raising the knees as much as I can , is still exercise. The postman may consider I am one of his madder calls as he passes the window with me stomping or dancing around with no one else in sight!! So I think in the beginning, having much shorter episodes on your machine in the beginning would be best. Perhaps you could use a timing way, so perhaps plan to try to do 5 minutes every hour, or listen to the news or watch it whilst working away, to let your body just learn how to do this exercise whilst your attention is on the news. Once your body is used to it , it will relax a little and get the habit and you could then increase it. Good luck. Another little idea is that you could have a couple of little, same sized glass jars and every time you use your machine drop a counter/dried pea/ button or whatever into the jar. At the end of the week, change to another jar, and over time hopefully you will see that you are doing more as you can compare this weeks level with previous weeks, to hopefully encourage you to keep going! Let us know what works for you and hope all goes well.