Jan Wellford provided some perspective:

New York's highest summit is also one of the Adirondacks' most runnable peaks due to the easy grade of the trail. The Van Hoevenberg trail beginning at the Adirondack Loj is the fastest way up Marcy. It is very eroded, littered with rocks and roots and often wet, but at least it's not that steep. I'm sure Marcy has a long history of running, hiking and skiing records, but I am having a surprisingly hard time finding out the details. I'm hoping this post will attract some attention from those who might know.

Boulder's Flatirons on the east face of Green Mt are an iconic location of moderate climbing and are the site of many speed records.