No, not the Art of Angling, although I have cast many a fly in my time in pursuance of that fine art.
‘Ankling’ may not need any explanation to the more experienced cyclists in my readership but maybe quite useful to some of the newcomers to cycling.
It is what first of all toe-straps and then later the cleat type pedals were designed for. It enables you to not only push down the pedals on the downstroke but also to pull up the other pedal on the upstroke at the same time. So on the downstroke you depress your ankle slightly below the horizontal and push down and then on the upstroke raise your ankle just above the horizontal and pull the other pedal up. This gives you drive on the pedals for more or less the full 360 degrees of revolution with each foot instead of just 180 degrees and makes for a much smoother ride.
Pressure for 180 degrees is fine when riding tempo or just cruising on the flat but when the gradient goes up or the wind is strong and you need a bit more speed or power you will benefit from ankling. It might take a bit of concentration and perseverence to get the technique right at first but it will soon become second nature. Try it next time the going gets tough. It makes for a much smoother climbing style. When you see riders in front of you swaying from side to side when they are climbing sitting in the saddle they are not ankling. It can also save you having to get out of the saddle to climb.