Fit armories are among the largest retailers in the world.
Some have a fitness component and others do not.
But they all sell products to the fitness industry.
They are the heart of the Fitbit, Jawbone, Garmin and other companies that are all trying to connect the fitness market with a broader market.
Some of them are building fitness gear to compete with Amazon’s Alexa fitness device, which launched earlier this month.
The idea is to give users a choice of the right accessories that will work with their specific fitness activities, or with the device itself.
There is also an opportunity for brands to offer products that are complementary to their own brands.
Here is what you need to know.