Meditation is increasingly delivered through smartphone apps. How app-based meditation training might be optimized is unclear. With Sona Dimidjian serving as discussant, Sin U Lam, Kevin Riordan, Zishan Jiwani, and Simon Goldberg present findings related to meditation app usage, meditation practice dosage, and meditation posture. Sin U’s presentation (Situating Meditation Apps within the Ecosystem of Meditation Practice: A Survey Study) investigates participant characteristics linked to app usage and persistence (N=953). Kevin’s presentation (How Often Should I Meditate? A Randomized Trial) describes the effects of meditation practice distribution (one 20-minute versus two 10-minute meditations per day) in distressed undergraduates (N=351). Simon’s presentation (Random Assignment to High- and Low-dose Meditation Practice) investigates assigning distressed adults to 5- versus 15-minutes of training per day (N=92). Zishan’s presentation (Sitting Versus Active Meditation: Utilization and Associations with Outcomes) uses data from naturalistic meditation app usage (N>60,000) and the meditation arm of a randomized controlled trial (N=314) to examine differences between sitting and “active” meditation (i.e., meditating while doing daily activities). Collectively, these studies shed light on training formats that may improve the acceptability and efficacy of meditation at scale.