Lief is Innovation Martial Arts senior Thai Boxing and K1 coach, his experience and fighting record is second to none. Lief began training in Muay Thai at the age of 8, as he progressed he fought as an amateur winning the European Championships and then becoming the 50kg World Champion. As an amateur Lief had 22 fights winning 18, drawing 2 and loosing 2.
In 2007 at the age of only 16 Lief became a professional fighter, he has had 16 pro fights winning 11 of them, drawing 2 and loosing 3. Lief has been the WKA English Champion at 60kgs and at 62.5 kgs, he is the WKA British Champion at 61Kgs.
Leif also holds a black belt in Kick Boxing and has a BSC Honors degree in Sport and Applied Exercise Science.