I'm not sure if anyone has pointed this out but the glider on the main menu looks like the glider from the skydiving game in Wii sports resorts. In other words we're
Skydiving - Wii Sports Resort Wiki Guide - IGN
Wii Sports Resort *SKYDIVING* | Video Games Amino
Review: Wii Sports Resort: Nintendo's Wii Sports reboot does more than go through the motions - Screens - The Austin Chronicle