A physical activity assistance apparatus includes a blood oxygen concentration measurement section (biological information detection section and blood oxygen concentration calculation section) that measures a user's blood oxygen concentration and a breathing instruction section that instructs the user to practice a predetermined breathing method when the blood oxygen concentration is lower than or equal to a first threshold. The thus configured physical activity assistance apparatus can appropriately support the user's physical activity.
PHYSICAL ACTIVITY ASSISTANCE APPARATUS, PHYSICAL ACTIVITY ASSISTANCE SYSTEM, PHYSICAL ACTIVITY ASSISTANCE METHOD, AND PHYSICAL ACTIVITY ASSISTANCE PROGRAM