Hi Martin5400! Welcome to the forum!
For me, the best exercise is done in the water. Serious exercise focusing on the core muscles (back and gut) has strengthened my body without doing damage.
You may know that we have water classes here that are free to residents. The one I go to uses water dumb bells, noodles and exercise bands and is open to men and women. We attend three mornings a week, for 50 minute classes.
Focusing on perfecting my form rather than counting repetitions has been the key for me, so no matter what type of exercise you are inclined to enjoy, I think that tip may serve you well. If I can only do 4 reps well, for me it is better than 8 sloppy ones to keep up with others.... I get more out of it and it's safer too.
Good health to you!
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