The changes in my training over the years

As I reach my mid 30s, it keeps getting clear to me that I cannot train as I used to earlier in my life.
During college and later when I joined the workforce, I could workout for 2 hours everyday and still could function well throughout the day. The recovery was never an issue. I would still be able to active throughout the day. Never had I felt the need to stretch, although I always did because I liked doing so. This is what has made me hyper flexible.
Now it appears I cannot do the same. Lately It is becoming clearer to me that I should change my plan.
This knowledge has not been made available to me without charges. For past few years I have been struggling with being active at the gym. I would go for a few days, workout and then something would happen. I would pull my shoulder, or sprain it or my back would give out.
Thus I would again have to take a break and rest till it heals.
For past few months I have been reading more about training and nutrition. A very important part of that is recovery. A part that earlier I would never think and would train 7 days if had time.
Now I only workout 3 days a week and rest of the days I only walk or do light cardio. This helps me keep my heart rate up and keeps the blood flowing. More blood flow helps in recovery much more. Even with all this, I can’t simply come out of bed and start moving. The way my son does. :D
I have to do small movements before I do the big ones. Ones like moving my toes, then ankle, pelvis, shoulders. If I get out of bed, without doing these, the body does not feel the same. It moves hard, with minor pains here and there.
A big weapon I am finding is taking warm shower after getting out of bed. You have heard of cold shower. Two times I took those and it froze my shoulder. I was walking like Robot for 3 days. Warm shower all the way.
Never had I thought the mid 30s would be like this but I have had years of bad posture, over training. The bill is coming now.
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