[1] He ran in the men's marathon but failed to finish due to cramping in both his legs after running 500 meters.

He then decided to take his running seriously and joined Nic Bideau's Melbourne Track Club.

[5] Later on in 2018, Jack won the inaugural half marathon Commonwealth championships in Cardiff in a time of 1:01:01.

[6] In October 2019 he was one of forty-one pacemakers in the Ineos 1:59 Challenge, where Eliud Kipchoge successfully became the first person to run the marathon distance in under 2 hours.

[7] In April 2019, Rayner made his marathon debut in London and clocked a Tokyo Olympic qualifier of 2:11.06, a time which has held up for selection for the postponed Games in 2021.