machine

As there are rowing machines are there kayaking machines for off the water/off season practice?

yes, google kayak ergometer ,nm

yes
http://www.kayakpro.com/



http://vasatrainer.com/vasa-kayak-ergometer.html



http://paddleone.com/



to name a couple…

Yes!
KayakPro makes a kayak ergometer called the SpeedStroke:

http://kayakpro.com/speedstrokegym/index.php



Or you could potentially make your own like I did:

http://youtu.be/v2VMVaGfOEI



I’m working on version 2.0 in the garage now…

Ugh
Sounds about as exciting as cycling “on the rollers” in the basement over the winter.

LOL!
Yes, I know, but it is great when the water is frozen or when the only time you have available is after dark.

Version 2.0 is complete
http://www.youtube.com/watch?v=JHc1xxfcW9s&feature=share&list=UUliXtlzMMiNYRAIyMAqvQug

Another vid of homemade kayak ergomer
Made from a Nordic Track ski machine…

http://youtu.be/mqhIhRdlpHs

Nordic Track to Kayak erg manual
Full manual on how to convert a used nordic track ski machine to a fully functional kayak erg



The erg works great and is just as fluid and water like as any commercial unit.



http://nordickayakerg.blogspot.com/2015/12/build-your-own-kayak-or-canoe-erg-from.html

Here we are a few years later but I’ve finally gotten down to a sleek, compact design that doesn’t look like it has a bed frame on the front of it. Plans will be coming in February 2018.
https://davethekayaker.wordpress.com/2018/01/21/home-made-kayak-ergometer-from-nordic-track-ski-machine/