Try 15-30mins on an exercise bike, or/and at intervals in the reading get up to do push ups or something. Same problem I end up mind wandering while trying to r

Try 15-30mins on an exercise bike, or/and at intervals in the reading get up to do push ups or something. Same problem I end up mind wandering while trying to read and having to flip back pages but exercise solved that. Taking active notes helps too, I'll have emacs open and write down anything I'll likely use again, index it in org-mode then year(s) later I'll need to look up something like generating all n-tuples and have an index.org file that spans the three books I read on the subject.