A Pedal Board, Anyone?

​Why paddle when you can pedal?
That's what this video is all about.

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​This is a stand-up leg-powered board
that feels like doing an elliptical machine.
Every step causes a fin under the board to paddle 
and the whole board then moves forward.
Just wondering how intense this could be
knowing that it's not that easy
to pedal a paddle on water
most especially when done at sea.
Seawater is way denser than freshwater
so more strength and energy is required.
Maybe anyone using this
should make sure not to get wet
in the process
because it's like doing leg workout
that you need to rest for quite a while
before hitting some water or bath.
It sure is a very fun and exciting way
to be in the water
rather than just swim or dive.
And also,
wondering how stable this thing out at sea
when considering the waves.
So it's important to wear some life vests
in case.