The Activity Arouser is a treasure found in Pikmin 2. In the NTSC version it is actually a Wilson tennis ball container lid that is found in the 3rd sublevel of the Submerged Castle, where it is held by one of the two Withering Blowhogs in the sublevel. In the PAL version it is a Sinalco bottle cap that is held by one of the Yellow Wollywogs on the 2nd sublevel of Citadel of Spiders. It is the 176th treasure on the List of Pikmin 2 treasures in the NTSC version and the 181th in the PAL version.
Captain Olimar's Journal
"This strange object makes me want to dance. I...can't...fight it... Must dance... Hey, this isn't so bad. I've been packing on the pounds, and this could be a great way to get some exercise! One, two, cha cha cha.."
"This esoteric design will make viewers want to get up and move for no apparent reason. This is perfect for people who want to diet but can never seem to get started."