A data logger for a monitoring sports which includes an accelerometer, a GPS unit to sense position and velocity, a heart rate monitor, a controller programmed to manipulate the data and provide a display of the heart rate, speed, and other sport parameters. When the roof supporting frames cross each other, the canopy is propped up and expanded to construct the playhouse into a three-dimensional space. The sealing device includes a first labyrinth arranged between the shaft and the housing, fins secured to the shaft and arranged in the first labyrinth, the fins being intended to discharge the fluid entering the first labyrinth toward the inside of the housing. The magnet system has an array of magnets forming a magnet array having opposite ends.