always good to use pedal devices

There is some benefit to your circulation from the pedal machines. Vigorous pedaling can add some cardio benefit as well, but hard to do while reading or knitting. Another consideration is that weight-bearing is a key factor in exercise effectiveness, especially in preventing osteoporosis. And exercise variety is important as well - adding stretching, flexibility & mild weight training.
So perhaps it would be best to consider a pedal machine as one component of fitness. Perhaps you can fid some on-line books or TED talks to listen to while walking, stretching, etc to add variety?
Sue

So pleased you have found a way to increase your circulation.The pedal machine as Sue mentioned has benefits as one component of exercise. One caution is that some people "sway" from side to side when they pedal .Ensure that you are sitting up straight and focus on using your legs trying to avoid swaying.

I really like that you may be active with needlework when you do sit. I believe that knitting is a type of fidgeting that does stimulate metabolism. I also agree that setting a time or if you have a smart watch to remind you to move routinely is a great idea. For me, commercial breaks (especially those horrific political ads) motivate me to get up and leave the room, stroll about the house, do a quick chore or stretch!