My grandmother, (lived to 98 yrs old) is a good example of what you are saying. Type A, red meat eater, plenty of fat, not to mention, plenty of other avoids as well. But she ate no junk (processed foods) and was very religious/spiritual and also ate and did a lot of things *Right for her type*.
Also, early type A's surely did strenuous activities, but didn't have traffic, pollution, chemicals added to their food, the social pressure to *look good* and go to the crowded gym, also, no TV or news (that alone would make a difference). Not to mention, lifespan was short for many way back then because of infection, dental problems, and having to survive the elements and harsh conditions without modern technology.
Farming, carrying water and firewood etc, are not the same as doing aerobics at the gym. And,,, Like Dr.D says in ER, "It's how our mind is engaged in what we do,," that determines our benefit or harm from exercise. The emphasis is on stress relief, not getting in shape, all humans have to get some exercise in order to build muscle and stay in shape.
My father died of heart disease at 62, worked out extremely hard everyday at the gym. It was also at the gym where he would experience chest pains, especially on the stationary bike. What he really needed was to go for walks and stretch, focusing on calming activities. The deadly combination of poor diet, his doctors, lack of rest, and tearing himself down with *heavy* exercise may have been too much for him.
You can bet eary A's ate meat and fish as well, but probaly went days or weeks on a plant based diet when meat was not around. So, by all means, get some exercise, just balance it with rest and calming exercise, (helps get rid of excess cortisol and adrenaline),,, and a little meat may do you good too.
Jon (ER 4+ years)