Check out this video of the Hyperbike which is a sort of bicycle you swim in. Or float through. The music is quite ethereal. He uses both his hands and legs to pedal at the same time. Supposedly it can get going up to 50mph. It looks like steering is done by pedaling more with one arm than the other, which seems somewhat imprecise. It does look fun though.
New Upgraded Travel Organizer, A Portable Case For Managing Cords, Wires, Electronics Items, Gadgets and Accessories, 12 X 8 Inch (Black)
Buyinhouse Convenient Style Kitchen Tool Finger Guard Finger Protector Avoid Hurting When Slicing and Dicing
ANGELANGELA 3222641 Universal Multi-Function Portable Spider Flexible Grip Holder for Smartphones and Tablets, Black