Activ8 is a system of three short games: See-Saw, a balancing game for Glass; Jump Beat, a music beat matching game for Glass; and Learning to Fly, a Kinect game where users keep a virtual bird in the air by flapping their arms. Recent epidemiological evidence points at sitting as being the most common contributor to an inactive lifestyle. We aim to offer a starting point towards designing and building an understanding about how "physical casual games" can contribute to helping address the perils of sitting.