its not that hard to make yourself throw up. Just go to a McBurnie run sprint work out and try and win every sprint. For reference, the array of bushes next to parking lot H provide pretty decent cover this time of year.
I visited them during a thunderdome event last fall, and found that with the leaves on the ground rather then the branches there wasn't so much protection from view. This time the leaves were there, providing much needed cover.
If you don't want the people roller blading or the chick walking her dog to see you barfing in spandex, or barfing in any other clothing for that matter, check out the bushes at parking lot H!