Did this for a while 2 kids. https://vimeo.com/150744961
First my daughter on the tandem, then 4 years later (2nd half of video) my son https://vimeo.com/150738045
My daughter took to soccer (lots of video), son to cycling. He loved the pain.

Training video - https://vimeo.com/109371142

I have done a lot of lab work over the years. This was a VO2 test that failed cause the guy would set the power where I told him.
https://vimeo.com/129016136