"The StreetStrider, currently the most recognizable mobile elliptical cross trainer, was developed based on a patent submitted in 2005 by David Kraus, PhD, and is produced by HPN Holdings, Inc., which holds the original single patent. The StreetStrider has proven the concept of the popularity of mobile elliptical cross trainers, with sales increasing annually since 2009 to a reportedly over Five Million Dollars in 2012."