https://cliveo2000ksin10days.wordpress.com/2017/08/20/day-3-slower-and-more-painful/
Good read - don't worry about ur low pulse, that's just how it is :)
@cliveo started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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https://cliveo2000ksin10days.wordpress.com/2017/08/20/day-3-slower-and-more-painful/