Thanks for your feedback. Both Gerry and I are LA Tri Club coaches and have mutual respect, we really have far more in common than what separates us.
I'm curious though of your "TI swimmer". Was she/he self coached through DVD/book only until getting live feedback from one of your coaches on deck?
The question wasn't rhetorical. Both propulsive and resistant forces work and react together for any vessel that moves through water. Propulsive forces must exceed resistant forces in order to move forward - I'm sure we can agree on that. Is it better to increase power to overcome resistant forces, or decrease resistant forces to move faster?
I've swam next to triathletes (many who are good swim friends) that have a stroke rate of 70-75spm, and I at 55-60spm - and both of us going the same speed or velocity. My priority is maintaining the shape of the vessel and getting a good grip/hold on the water, while the triathlete in focusing on the low side (pulling arm) moving water back fast. Both arrive at the same solution (or speed) given the problem. It all comes down to some math that many seem to reject or ignore, math that started with Bill Boomer and Terry notes in his presentation. SPM * SL = Velocity or speed. Like propulsive and resistant forces, stroke rate and stroke length are not mutually exclusive.