Note that this market research database will require you to create a personal profile to save searches, create presentations, and receive email alerts - use your Penn email address as your username. Then, browse by scrolling over Category (like Health & Nutrition), or search by keyword (e.g. "fitness"). Reports have consumer survey data analysis, and focus on the US and Western Europe.
Search by keyword (e.g. "yoga") to find reports spanning various products/services available for the fitness industry. While most are traditional and follow the North American Industrial Classification System set out by the US Census Bureau, they also create specialized industry reports for niche products/services.
This database collects market research reports written by several providers, and has good coverage of apparel and accessories. Browse the headings under Consumer Goods & Retailing on the main page, or search by keyword (e.g. "wearable devices"). Reports are generally US-focused, large (300+ pages), and comprehensive.
Great coverage of countries around the globe. Click on Search in the top left corner, then expand the Countries & Consumers menu to find Leisure and Lifestyles --> Leisure Time --> Sport and Exercise. Select from many geographies, then Run Search. They'll have great data on exercise trends by countries.