For the Ergometer
The videos for the erg would be cool if it looked like you were actually rowing on a body of water through beautiful locales.
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Rusty Castleman commented
Rowing is becoming more and more popular, especially with older folks like myself because of the "low impact" on feet and knees. Why not make a rowing video or two and try them out? They probably don't need to be as long as the others you make -- I find that about 30 mins of rowing is the most I do. You should discuss this with Concept2 who make the defacto standard rowing machine. They have a very capable monitor that connects with their app as well as a heart rate monitors.