Oisín Mulligan
Oisín Mulligan is the Irish creator behind Mulligainz Fitness, sharing plain-spoken fat-loss advice, coaching and conversations about confidence.
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Oisín’s happenings, collected from public sources, plus his backstory and Starbook, where fans write.
Known for
TikTok
YouTube
YouTubeOverview
- From
- From Athlone, County Westmeath, Ireland
- Also known as
- Mulligainz Fitness
- Training
- Sports Science graduate, Athlone Institute of Technology
- Breakout
- 2021 McDonald’s TikTok challenge
- Coaching
- The Mulligainz Method
Mini bio
How it started.
Oisín is from Athlone in County Westmeath. He told the Irish Mirror that he had planned to study architecture at the University of Limerick before his own weight-loss journey drew him towards nutrition and helping other people. He went on to graduate in Sports Science from Athlone Institute of Technology.
The video that travelled.
In 2021, he documented eating something from McDonald’s every day for two weeks. The challenge brought wider attention to his TikTok account. He explained that he wanted to show people they could enjoy favourite foods in moderation while losing weight.
Where fans find him now.
Through Mulligainz Fitness and the Mulligainz Method, Oisín shares fat-loss advice and offers online coaching. His programme includes an app community, weekly check-ins, workout plans and group calls. In June 2026, he introduced One Step Forward, inviting listeners to send voice notes about confidence, feeling stuck and taking the next step.
Creditschronological, newest first
Original videos and podcasts
- 2026One Step ForwardCreator and host
- 2026I Was Fat, Got Fit, Now I CoachCreator
Guest appearances
- 2025TAP IN. SPEAK OUTGuest discussing his weight-loss journey and coaching business
- 2024Born to Thrive PodcastGuest with Alex Allen
- 2024Elevate Fit FestAnnounced Talk Tent speaker
- 2023The Brian Keane Podcast, episode 450Guest, recorded live at Elevate
Quotes
my purpose is to leave you in a better place than before you got hereOisín Mulligan, Mulligainz Fitness
His coaching website describes the support he wants members to receive.
Trivia
- He originally planned to study architecture at the University of Limerick.
- His One Step Forward podcast invites voice notes of up to four minutes, with first names optional.
- His coaching programme does not require members to share their weight or progress pictures.
Find Oisín
Find Oisín’s videos, coaching and conversations on his official channels.
Are you Oisín Mulligan?
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