Different strokes for different folks - measure effectiveness

Different strokes for different folks.
Ruuvi is the perfect device to analyze efficiency of strokes for paddlers and rowers of canoes, kayaks and sculling.

The accelerometers can measure forces being applied by the paddle or oar.

Since the ruuvi is waterproof and weighs less than 25 grams it can be directly attached to a paddle or oar.
Be sure your phone is safe from water too!