STAmina is created by and for freedivers with the ultimate purpose to improve your freediving skills by increasing the breath-holding time. STAmina is all about O2 deprivation and CO2 tolerance tables. It allows you to configure the tables to correspond to your skill level. It leads you through a workout with visual and voice notifications and tracks the history of your workouts. Features: CO2 tolerance tables O2 deprivation tables Mix tables Wonka tables Custom tables Tables Generator Male/Female voice notifications Training notifications Unlimited workout log Personal best tracking and history Workout statistics