Amazon has added two more add-on subscription options for Prime members. The first is HI-YAH!, a collection of martial arts movies. The library currently consists of 27 movies like My Way and Blade of Kings. A subscription will run you just $2.99 per month and it comes with a 7-day free trial. The second new add-on subscription is Grokker, a fitness network with an emphasis on yoga. A subscription grants access to around 150 videos covering healthy eating, pilates, meditation, yoga, and more. Grokker will cost you $6.99 per month and also comes with a 7-day free trial.