Sports item usually seen in pairs

Usage examples of waterski.

Jet-skiing, parasailing, and waterskiing were all banned from December until April, while the humpbacks were in these waters, so many of the smaller boats that would normally be used to terrorize marine life in the name of recreation were leased by whale researchers for the season.

He can go surfboarding, rollerblading, waterskiing, rally-driving, scuba-diving, ten-pin bowling, white-water rafting and rowing.