Originally Posted by datlas

BTW I do agree with @BillyD, but I must also point out bias in this population. The infrastructure at Woodstock was rudimentary and services overwhelmed by the massive turnout. That means the people who made it to the show had to be hardy enough to walk many miles and thus if someone were heavy and of poor fitness, intolerant of the heat and wet, etc., they would have not gone or turned back.

Observational studies are full of biases so one must be very careful drawing conclusions.