Training Nikic trained with Dan Grieb, who has completed 16 Ironman races, for four to eight hours each day for around one year. He began exercising in 2017 with a single pushup and aimed to improve his performance 1% each day. Nikic is also training for the 2022 Special Olympics USA Games.
2020 Ironman Florida Nikic completed the Ironman Florida triathlon in 16 hours 46 minutes 9 seconds, swimming , cycling , and then running a marathon . This earned him recognition from
Guinness World Records. His time was 14 minutes faster than the cut-off time for qualification.
2022 Ironman Hawaii Nikic bested his Florida Ironman time two years later in the 2022 Ironman World Championships in Kona, Hawaii, with a time of 16 hours, 31 minutes. In announcing Nikic's record-breaking feat of being the only person with Down syndrome to complete two IRONMAN competitions, the
Special Olympics announced the triathlete's designation as a Special Olympics Champion Ambassador, "for the impact he's made on the organization." == Early life ==