Not too sure whether my journey to back finning will be the same but with the frog kick, I was actually doing it right in the water BEFORE I planted my tummy on a chair to emulate the divers in a training video. It was just that it didn't feel like I had my knees at a 90 degree angle and my feet didn't feel as if they were at my head level. Was only after recording myself on video that I realized I'd been trying too hard all along and ended up having an arch in my back.