Meet the PhysicalMind Institute TYE4X: a wearable resistance system that lets you engage your entire core anywhere. It is also great for yoga, pilates, posture training and barre workouts. It features adjustable resistance. It weighs only 8 ounces, so you can easily take it with you anywhere.
This resistance trainer comes with a free iOS/Android app that shows you how to get the most out of your TYE4X. More information is available here.