As the graph below shows. Yoga is trending higher than even cycling these days. If you are into numbers and trends I think you may find some really interesting information about trends in Google search queries. While this does not necessarily mean that cycling is not as popular as Yoga. It just suggests interests that people are searching for on Google. But just try something like VCR repair vs Cell phone repair as a trends search query. Or Surfing vs. Snowboarding notice the months that people search and the spikes in winter for Snowboarding.
Snowboarding vs. Surfing
Check out Aerobic Exercise vs. Yoga