The list of challenges that taekwondo Team GB star Lutalo Muhammad has faced is long: selection controversy, hate mail, a last-gasp defeat at Rio 2016... and, now, changing weight divisions.

This episode is the final in a special series with double Olympic champion decathlete Daley Thompson as co-host. To celebrate 40 years since Daley won his first Olympic title in Moscow, we've chosen one athlete from each decade - the 80s, 90s, 2000s, and 2010 - to see how they chase their dream, no matter what.