You can sprint for about 12-15 seconds and it should do the trick. Probably not a coincidence thatt it's about the same length of time to deplete your ATP/CP system

I think the sprinting for about 15s is the ticket.

Or measure out a space using a Google Earth path.

Go to central park, jog along the road there for ten minutes or so to warm up, and then just take off sprinting, saying in your head "one chimpanzee, two chimpanzee, three chimpanzee..." All the way up to 15 chimpanzee. Stop, bend over for a minute in agony, then walk or jog for a minute or two. repeat as desired, ideally turning around when you think you're halfway through so you end up close to where you started.

Had a similar problem when I was living in Paris, though I was making a bit longer sprints.

If you don't want to waste time, just sprint on the sidewalk of a long block - they are not that busy with people most of the time (they are about 200 meters long). Not the greatest fun to watch out for people popping up, but might be enough.

I also recall it's never more than about a kilometer from any point to the eastern or western shore promenade, where you have continous pedestrian area.

By the way, still waiting for a question to be posted, "Is Manhattan Paleo?"

What's so magical about going exactly 100 yards?

Join a soccer team and you can sprint 100 yards several times every minute.

Not sure where in Manhattan you live, but there are some tracks in Brooklyn that might be easily accessible to you.

McCarren Park (outdoor) Redhook Ball Fields (outdoor) Park Slope Armory (indoor)

There are some spots in Manhattan listed in this thread: http://www.coolrunning.com/forums/Forum10/HTML/003488.shtml

Never been to any of them, but they are all obviously somewhat inconveniently located b/c of the space constraints ;)

Why not run up stairs for 15 seconds or so?

IMHO, your not really going to do 100 yard sprints, at least, not for long. Shoot for shorter sprints, like 40 yards or even 20. And unless your super cardio man already, don't run up stairs, you'll stop to catch your breath, faint, and fall backwards and get found in 3 weeks by a maintenance guy.

find out what width parking spaces must be in your area and use an empty parking lot or find a street with light standards. you could also walk 20 paces and measure how far you walked; do it a couple of times and average it out.

Well just walk 100 paces and you'll have a rough idea.

u can always sprint in place, cmon this isn't a predicament

I would measure it out on google earth (as suggested above) and/or do telephone pole sprints. In the town I used to live in, two poles were 50 meters, 4 was 100. Also, aren't the long crosstown blocks in Manhattan longer than 100m?