VANCOUVER, WASHINGTON--(BUSINESS WIRE)--May 4, 2015 - Nautilus, Inc. (NYSE: NLS) today reported its unaudited operating results for the first quarter ended March 31, 2015. Net sales for the first quarter of 2015 totaled $96.2 million, a 34% increase compared to $71.9 million in the same quarter of 2014. The strong growth was driven by higher sales in both the Direct and Retail segments. Gross margins for the first quarter improved by 250 basis points to 56.0%, reflecting margin increases in the