Although an international coach he is most noted for his inception and development of "Northwest Territories Style" Freediving, based on relaxation and breathing techniques (1st published in 2008). He has coached many athletes, setting 12 National records in all of the AIDA recognised disciplines. He has personally held several United Kingdom records in depth apnea free-diving disciplines recognized by AIDA International.
His Club Freediving (NoTanx) based in London is now the largest group of freedivers in the United Kingdom has grown exponentially since 2001 to having 7 weekly pool sessions with 80+ active members.
All training is split into Yin and Yang, with an emphasis placed on Yin (soft, slow & internal). Marcus was coach for Herbert Nitsch from 2006 - 2008, including his Number Limits dive to 214m and 2 Constant Weight World Records.
Marcus has recently coached relative newcomer and rising United Kingdom star Alan Barber to a Dynamic Number Fins record of 127m and several Dynamic Records culminating in the 2009 record of 202m. In 2012 15 club members featured in the top 10 of their National Rankings
Loic"s concept of relaxation and enjoyment was inspirational and Instrumental in the NTStyle.
Psychological emphasised and correctly constructed training regiemes devised by Marcus were innovations within the sport in 2003-2004.
("Principles of correct training"). He became a student and advocate of Aharon Solomons in 2002 and keeps close ties him, quoting him as a mentor and inspiration. Marcus is an international freediver in his own right.
He set his first 2 United Kingdom records, Free Immersion -47m and Constant weight Number fins -25m, in NDAC in 2003. and bettered the Free Immersion to 50m in 2004.
In 2007 he was ranked 13 in the World. He started competing again in 2010 although his competitive dives are marked by his reluctance to take them seriously
Building on the Northwest Territories Style freediving, Marcus teaches derivatives of the techniques to a huge range of people.
Through seminars, small group tutorials and one to one coaching he shows that efficient brain function and relaxation have benefits throughout life. Marcus claims that his techniques have been used for: Submillimetre Common-User Bolometer Array diving (extended dive time), General sports (focus and relaxation), Exam preparation (stress control).