TDK, I agree with you 100% regarding this being a good dryland drill but you can still do this one year round, in the water, on a boat, in the snow, on the chairlift, on the seat of a snowmobile, on the kitchen table, hanging from a chandelier and, from what I've heard, some even do it in beds and on couches, so ... I guess there is no excuse not to follow through with such exercises. The only trick is finding a willing participant. A Craigslist post in the ballerina section and meeting over coffee would be a good start. Just make sure to first consult with a pulmonologist and try to remember that this is a family site.