Hi. I own an online personal training business and have a few tips for you.
That is awesome that you are speed walking 6X per week! However, you may want to add in some different cardio so that your body doesn't get adjusted to the same routine. Doing the same thing all the time can make your body find that it doesn't have to work as hard. I would suggest mixing it up. Adding in other activities: maybe jogging, biking, jumping rope or even speedwalking/jogging (for example a split of 5 minutes walking followed by 1 minute of jogging). Even just varying your speed walking routines would help -- so that you aren't doing the exact speed/incline/distance every time you get on the treadmill.
How often you should rest between sets really depends. If you are working the same muscle in a row then you should probably rest at least one minute between sets. However, if you are working different muscles you can probably rest just 30 seconds. Plus, if you do it this way and reduce your resting time, you will also get some cardiovascular benefits.
You definitely can still get stronger at your age! Lifting weights is a great idea because the main reason people's metabolism slows as they get older is because they lose muscle as they age. If you are not getting sore at all, then you may not be lifting properly. When you reach your final rep of each exercise, it should feel very difficult to complete it. If it doesn't you may either be doing too few reps or using too light of weights.
Hope this helps.
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