Jerzygirl - Glad you're realistic in what you can achieve. If you try too hard you'll simply give up and quit altogether, sooner or later. But just the weekend isn't a good strategy either. Once or twice maybe try before and after work, splitting it up during the week. Or if you can, try three sessions of only 10 minutes, which will equal about a 30-minute single session.
As I've read, the one that finishes a race last uses the same energy/calories as the one that came in first . . . it just took longer to do it. So maybe the answer is to step up the pace a bit. That doesn't mean full out max all the time. If not used to it, try intervals. Actually, intervals 2 out of 3 times a week is often good strategy for those with lots of experience. If inexperienced, start easy with one minute intense, then three at an easy pace. Once you get used to that, then up it with two minutes intense, then two slower . . . eventually getting to several intense minutes with a slow minute "break" in between. Mix it up and do by distances, such as 440 yards alternating fast/slow. Find what works for you. But change now and then.
Perhaps better yet, alternate between the upper two heart rate target zones. That way, if you aren't up to par some days, your heart rate will increase faster. That's really using your device to maintain effort. - Ron
