Alex Sierra Minduin
Alex Sierra Minduin's BJJ story links study with Jorge Medeiros and Fabricio Werdum to teaching across Spain.
Biography
Sources for this profile
20minutos, Paula Pérez, 2 October 2026.(opens in a new tab)
In October 2026, 20minutos identified Alex Sierra Minduin as Héctor Muriel’s coach within the Checkmat Madrid training environment and among the pupil’s role models.
Where in the source: Coach paragraph and named pupil–coach photograph.
Accessed:
Brasa Madrid, instructor introduction, Cesar, 13 February 2008.(opens in a new tab)
Brasa Madrid’s February 2008 instructor introduction called him Alexandre ‘Minduin’ Sierra, then a brown belt. It traced his learning from Jorge Medeiros in Rio de Janeiro to Fabricio Werdum in Madrid. It reported over ten years practicing and over five teaching, including Madrid and Vitoria, a dispersed team exceeding sixty practitioners, and a new Brasa Spain role under Cicero Rocha’s supervision.
Where in the source: 13 February 2008 instructor introduction, all paragraphs.
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BJJ Madrid, Kenneth Gautier Cerrutti, 25 October 2007.(opens in a new tab)
Kenneth Gautier Cerrutti’s October 2007 visit placed Sierra ‘Minduin’ with TNT, Team No Team, at Madrid’s Kiofu gym, teaching progressive Gimnasia Natural exercises for seated or hook guard.
Where in the source: 25 October class-visit post, complete written account.
Accessed:
An October 2007 Hummer Man Fight 2 organisers’ message named Sierra ‘Minduin’ and Vicente Tamayo. Their stated aim was to give Spanish and Spain-based MMA fighters opportunities against internationally established opponents and a route towards larger events.
Where in the source: 8 October organisers’ message and closing names.
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Kairos Krav Maga, Shimmen, 31 August 2010.(opens in a new tab)
On 31 August 2010, Kairos Krav Maga welcomed Alexandre ‘Minduin’ Sierra and his training group to Escuela 360º, describing him as a BJJ black belt and Checkmat’s Madrid representative. It offered BJJ classes alongside the school’s Krav Maga programme.
Where in the source: 31 August welcome post, identity and class sections.
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Checkmat Madrid, older official teaching-location page, undated.(opens in a new tab)
Checkmat Madrid’s older official contact page names Alexandre Sierra ‘Minduin’ as its black-belt instructor and lists classes at Club Deportivo Esquerdo and KravMaga 360.
Where in the source: Instructor heading and both numbered teaching venues.
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Krav Maga 01 Madrid, seminar report, 11 February 2018.(opens in a new tab)
Krav Maga 01 Madrid reported a three-hour seminar by Sierra on 10 February 2018, accompanied by Checkmat instructor Daniel Mármol. For Krav Maga practitioners, the lesson moved from taking an opponent down to ground stabilisation, transitions and straightforward submissions; the hosts praised the instructors’ explanations and assistance.
Where in the source: Completed seminar report, teaching sequence and thanks.
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BJJ Canarias, GRIPS&MICS 102 written introduction, 23 May 2020.(opens in a new tab)
The written introduction to BJJ Canarias’ 23 May 2020 GRIPS&MICS episode identifies Checkmat Madrid’s head as Alexandre Sierra do Nascimento, and describes his progression from training with Fabricio Werdum to Checkmat with his teacher Leo Vieira.
Where in the source: Episode date and complete written description.
Accessed:
Checkmat Madrid, new academy announcement, 31 May 2019.(opens in a new tab)
In a May 2019 announcement, Checkmat Madrid planned to open its remodelled Esteban Collantes 32 academy on 3 June, with a column-free 140-square-metre mat and a children’s area for parents attending training.
Where in the source: Opening announcement body; public publication-date metadata.
Accessed:
Checkmat Madrid, adult class programmes and structure, undated.(opens in a new tab)
Checkmat Madrid describes adult teaching in four stages: BJJ-specific warm-ups and repeated drills; explaining positions, grips, controls and alternatives; positional practice with changing partners at moderated resistance; then sparring. Its basic programme combines self-defence with standing and ground fundamentals, while advanced classes develop more detailed applications.
Where in the source: Adult programmes and all four class-structure sections.
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Ondovilla Fight Club, Checkmat BJJ programme, undated.(opens in a new tab)
Ondovilla Fight Club in San Vicente del Raspeig identifies Alexandre Sierra ‘Minduin’, responsible for Checkmat Madrid, as the teacher of its BJJ instructor Iñaki and the connection through which it follows Checkmat’s technical programme.
Where in the source: Somos Checkmat section, Sierra–Iñaki relationship paragraph.
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Irimi Madrid, Daniel Villamor biography, undated.(opens in a new tab)
Irimi Madrid’s biography of martial-arts instructor Daniel Villamor says he continues learning jiu-jitsu and grappling with Alexandre Sierra at Checkmat Madrid, distinguishing this from his judo training with José Alberto Pérez.
Where in the source: Villamor biography’s final cross-training paragraph.
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Canto Martial Arts, BJJ programme, undated.(opens in a new tab)
Canto Martial Arts’ BJJ page describes its Checkmat affiliation as directed by Alexandre Sierra with supervision by Daniel Mármol.
Where in the source: Affiliation statement before seminar headings.
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Checkmat Madrid, Leo Vieira seminar report, 20 August 2026.(opens in a new tab)
Checkmat Madrid’s August 2026 written report describes Leo Vieira teaching at its academy on 20 June, with participants from white to black belt working on technical details and his emphasis on technique, training together and careful work.
Where in the source: Seminar body; public publication-date metadata.
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Lineage
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