4. STUART HOGG – EXETER CHIEFS – 11.6 SECONDS (100M)
Hogg broke Glasgow’s club record by hitting a top speed of 36.8kmh (just under 23mph) in training. In contrast, the Greater Roadrunner bird can only hit 20mph, while, back in the human realm, the top speed ever clocked by Usain Bolt was 27.8mph in the Berlin World Championships of 2009 when he set the still-standing 100m record of 9.58 seconds.