People were much thinner then, especially guys. They had lean torsos and narrow shoulders and scrawny legs. A lot of them had stoner's swayback, but that's a separate issue. You have only to check out MTV's perennially rerun spring break special to see how radical the evolution in men's bodies has been. The age cohort on spring break is the same as at Woodstock.
Any similarity ends with that.
The women, too, look different, of course, although not as markedly. Even braless hippie chicks knew pretty well what the culture expected of them. But hold a picture of the Woodstock man alongside the MTV guy, and you'll be shocked by the difference. Where one has a perfectly agreeable pectoral arrangement, the other resembles a Playtex model. Rodale, you may recall, is the Pennsylvania-based press founded on a roster of organic gardening journals.