Breaststroke and Butterfly. The butterfly requires hip-action for leverage. Photo Credit Swimmer image by PhotoMan from Fotolia.com. Breaststroke and butterfly require lifting your head out of the water to breath, an action that depends largely on arm and leg power, not neck-strength.
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In general, the higher the BTU rating, the more electricity your unit will pull. And, of course, the energy draw will vary by make and model. 6,000 BTU Air Conditioner (approximately 560 watts). This unit could cool a room up to 260 sq. ft. 1  24 hours/day: $2.42 per day or $72.58 per month.2  The math: (560/1,000) x ($0.18 per kWh) x 24 hours per day x 30 days. 3  12 hours/day: $1.21 per day or $36.29 per month.,000 BTU Air Conditioner (approximately 560 watts). This unit could cool a room up to 260 sq. ft. 1  24 hours/day: $2.42 per day or $72.58 per month. 2  The math: (560/1,000) x ($0.18 per kWh) x 24 hours per day x 30 days.