My wife and I have been riding together the forty years we've been together and she's been my stoker for 18 years. Riding the tandem a lot more in recent years since I stopped working weekends and she cut way back on her weekend work. Lots of club rides and rides from home have helped us get in 1000+ tandem miles annually the last few years. I ride a lot more than that but she figured out at some point that our tandem riding works better if she does at least of couple of solo training rides weekly. People still tell me that "she's not pedaling" but I can feel the power.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer