My anomalous running moments occurred when I would adjust my hip angle in such a way that my left leg had more freedom of movement, and even then that 'trick' would only work on occasion. Turned out I had a left thigh bone so large in diameter that I rarely had any range of motion, but somehow I would get some at those moments because I had tilted my hips. or in my 20s because I had electricity run through my hip joint to enliven the nerves.
HS Soph CC in October: won a fresh-soph CC dual meet race in a time over 30 seconds faster than the time on the course previously run in a big race that had featured several of the top fresh-soph in the state.
HS Senior in November: ran mile on HS's dirt-sand track in training shoes: 4:28. We had calculated that the HS track was 2-2.5 seconds slower per lap than a regular track. Training shoes cost 2-3 seconds per lap.
College Fresh in January: TT in spikes and on the fly: 22.4 through 200m, 48.5 at 400m, 64.6 at 500m.
College Fresh in Apr: ran 200m on fly in spikes--was 10.5 off the curve and the timer thought I would run 20.7, but the last 40m my legs just couldn't maintain and I only ran 22.5. Years later I found out about the problem with my range of motion, and probably the nerves had deadened the last 40m.
College Fresh in Apr: ran 5 x 200m on fly in spikes with 400m jog and 200m walk (run with a teammate): 21.3; 21.7; 22.2; 22.6; 23.2.
College after Fresh year, in summer open meet: jogged first 100m of 400m in 15 seconds so that a teammate (steeplechaser) could run good 400m (too many runners, so we doubled up in the lane). With 300m left, I took off and then cruised the last 100m, running 52.2.
College (2 years later) 10-mile Sunday morning run in between CC and track season; ran with guys renting rooms in a house. We ran on a dirt path that was 5 miles out, 5 miles back. We were 25 flat at the 5 mile mark, then I started cruising back and two of the guys kept the pace until around 8 miles, then floated in. I ran 55 min, and those 2 guys ran between 52-53.
Several years later, on a dirt track, ran 48.6 400m relay split in training shoes. Figured that was 47-47.5 in spikes on tartan track.
In late 80s, ran first 5 miles of Malaysia (Airlines) Marathon in 25.25, before Nike Sock Racer sole separated near the toe box on left shoe. Could not have held pace much more than 7 miles, but I wasn't tired at 5.
A year later, ran a measured 1/2 mile on a road in 1:53 (after I had electricity run through my hip area 3 times in a couple of weeks). I was 29 years old by then.