Fitness should be for life. I think Insanity misses the mark here as do many other programs. Any workout program should not just be a quick fix but it should lead to a healthy fitness based lifestyle that should adapt with you as you age and your body changes. Insanity is not that kind of workout.
Unless you are a serious athlete, I think most people would be better off doing physical activities that they can do forever as long as their bodies are able. I am 50+ and have always lead a fit exercise focused lifestyle. Obviously I cannot maintain the same level of intensity in my routine at 50 as I did at 20 but I still do the same kind of fitness routines and have just adapted them to my aging body. The most drastic change I’ve seen as I age is in my running. My joints are not quite what they used to be so I’ve had to slow it down some. I no longer run 7 miles in 60 minutes 5 days a week as I did 10 years ago and you know what? I don’t need to! I can walk, jog or run for an hour or even as little as 30 minutes plus muscle and flexibility work 3 or 4 times/week and feel and look as good as I did when I was in my 20’s. I jog and hike and I walk and take the stairs. It is a lifestyle choice that is for as long as I am able.
Nutrition and diet should be approached with the same mentality and it is not necessarily a one size fits all formula. It doesn’t hurt to consult a nutritionist to find out what is best for you. It must be sustainable and not just a quick fix. Learn about nutrition and do not focus on “dieting” and I think most will find that they don’t need to subscribe to fancy slickly marketed gimmicks to be healthy and fit!
I am a 50+ female and outside of my pregnancies my weight and size has been stable for 30 years. My weight stays within 5lbs above or below my natural normal healthy weight although I do not weigh myself often…scales are too obsessive for me. I can tell by the way my clothes fit, the way I look and feel whether I am doing what I need to do. If I feel a little off I change up my routine and adjust my diet accordingly. It’s second nature to me and for a fitness and health routine to be successful for life it needs to become second nature.