Make it “Fun to Fail” You should be looking for ways to challenge yourself every time you exercise to the point that you don’t complete every rep, or every exercise or perhaps the distance you set out to run. Once your body adapts and knows what is coming it will stop responding so you must find pleasure in “failing” when long term results is what you want.
Make an exercise and nutrition plan for your week and stick to it. Especially as we get older, Weight management is 80% nutrition and 20% exercise. There will always be a “life” that will get us off track, but expect it, and get back on your plan right away