Hundreds of people coming together to practice yoga on the National Mall is a beautiful dream, but it might have its downsides: Too many many people in Spandex! The Washington Monument might fall on everyone! And what if the U.S. Park Police think yoga looks too much like dancing? But maybe such anxiety is proof that we need yoga after all. Plus, because this year marks the 100th anniversary of Japan’s gift of cherry trees to Washington, the group yoga event is aiming high—even higher than hundreds of butts in the air during downward dog. Local experiential ambient-music duo Bluebrain, which is soundtracking the event, attached a heart-rate monitor to event leader Alison Adams as she went through the poses she planned for the day. Bluebrain came away with a tempo map that will form the backbone of their music, rising and falling depending on the session’s intensity. All levels are welcome to join. Bring your own mat—and running shoes, just in case the Washington Monument decides to enter plank pose. Cherry Blossom Yoga begins at 10 a.m. at the Sylvan Theater, Independence Avenue and 15th Street SW. Free. facebook.com/CherryBlossomYogaDC.