I've always trained with low-volume, and heavy weights. Basically I've been doing this for the entire 23 years I've been training and have built my bodyweight up to the mid 240lb range at a body fat around 15%. I've espoused a powerlifting/functional strength style and avoided the "bodybuilder" style of training with light weight and high reps just to pump up the muscle for looks. Now that I'm in my mid-30's I've noticed with the help of x-rays of my spine, I can't go super heavy anymore due to calcifications of vertebrae, impingements, chronically sore tendons and joints etc. So I'm now looking forward to a new phase of training where I'll maintain the muscle I have while rehabing old injuries and avoiding new ones. I'll be replacing heavy weight with much lower weight and faster reps and doing more cardio. For health reasons I feel I should weigh around 220lb and not 240lb. at 5'10'', and possibly get my bodyfat down close to 10%.
Has anyone else in their 30's or 40's had to change to a routine like this? I plan to do 20+ reps on all sets, and doing leg press and hack instead of regular squats, and not going to failure, but looking to work to muscles with good form, and not worry so much about my strength.