Meet the iWobble Board: a fitness tool for yoga and core training. It has a load capacity of 300lbs, so it can handle adults and kids. You can use this as a rocking board, core & leg trainer, and a balance board. You can use it to perform leg lifts, bridges, back exercises, bird dogs, push ups, torso stretches, and other common moves.
iWobble comes with anti-slip pads to protect your floor. It measures 39″ long. You can find out more about it here.