Are your parents fit & if not, have you tried to encourage them to get fit? If so, what is their exercise regime? If your parents are fit, were they influential in your commitment to fitness? What do your parents think of your fitness commitments? Are they encouraging or do they worry you're excessive?
"Strong Women Stay Young" by Miriam Nelson, Sarah Wernick
I'm thinking of getting this book for my mother -- along with some basic weights. I found it very inspirational a few years back when I first got into fitness. Granted the exercises are for an ultra-beginner, but that's where she is.
Years ago she took up some mild weight training -- part of her doctor's 'prescription' for an ailment she had. About 3 months later she remarked that she had taken all her curtains down, washed them & put them up again & she was surprised how easily she climbed the ladder -- more confidence -- & that the next day she wasn't sore. I was thrilled to hear that & told her it was her strength training paying off. She agreed that was probably it.
Then she dropped it all. Now, approx 7 years later, I watch her walk & climb stairs & she is clearly not confident of her balance. Since I'm getting back into all this, (partly inspired by observing her!) I thought it would be a good time to encourage her to do the same.
After typing all of this, I realize that many of your parents are close to my age & my mother is closer to your grandparents age!