Gravity Coaches and Guides

Gravity Nelson is super excited about how its mountain bike coaching sessions have taken off, and that success is no doubt in part due to the extensive experience and qualifications of our coaches, plus our unique “bespoke, inclusive, enthusiastic, progressive and supportive” approach to mountain bike coaching for all levels and styles of riders.

Our coaches are highly qualified, skilled and experienced riders. We don’t settle for just any old bloke – this team is stoked on bikes and on getting others out to experience the awesomeness of this sport and the rad-ness of the Nelson area.

The Gravity Nelson core coaching team consists of Alistair Matthew, John Butler, Skye Irwin, Callum Bryant, Christine Ma, and Brady Stone.

Below is a small outline of the mountain bike riding and coaching background of each member of our team:

MTB coaching, mountain bike coaching, crazy horse nelson

Alistair Matthew: Mountain Bike Coaching in Nelson New Zealand

Alistair “El Jefe” Matthew: Mountain Biking in New Zealand and around the world for more than 27 years, founder of on Bolivia’s infamous “Death Road”, 20+ years of guiding and coaching mountain biking.

  • PMBIA Level 1 qualified (,
  • NZOIA Level 2 senior instructor ( note that the MTB stream details are still to be added to the site),
  • Skills Active soon-to-be-launched Mountain Bike strand of the Outdoor Leadership Certificate (Level 4 Instructor, Level 5 Guide, Level 5 Instructor, and Level 6 Instructor… yes, all of them … how’s that for a mouthful) refer:
  • Alistair also holds several first aid qualifications including Pre-Hospital Emergency Care ( and multiple workplace one day first aid courses (including mountain bike and volunteer fire brigade specific courses).
  • Alistair specializes in:
    • Cornering clinics for all levels of riders
    • Drops clinics for beginner to intermediate riders
    • “Mountain biking myth correction” for experienced riders
    • Mountain bike squad youth development programs
    • Parent and child sessions
    • Confidence building mtb psychology, body position correction, and safe progression sessions for riders who feel stuck at low to mid Intermediate level
Mountain Bike Coaching, hard-tail mountain bikes, full-suspension mountain bikes, advanced mountain bike skills, mountain bike jumps, mountain bike gaps, technical cornering

John Butler: Hard-tailing at the Gorge

John “Baby Face” Butler: John has guided, coached, built trail, ridden and raced around the world including Chile, Bolivia, Colombia, Whistler, and New Zealand for far more years than his baby face suggests. His qualifications include:

  • Whistler’s in house coaching course (Pre-PMBIA) Level 1 and 2
  • Cycling New Zealand Accreditation
  • Pre-Hospital Emergency Care ( and St John First Aid Level 1 (
  • John specialises in:
    • Intermediate to Advanced jumping, pumping and drops
    • Advanced cornering on challenging terrain

Skye “Not related to Steve” Irwin: Skye is originally from Canada and has been working at 440 MTB Park in Auckland, but we don’t hold it against her. She has been riding for 3+ years on Vancouver Island and through the Rockies, and has a background of rock climbing and personal training.

  • PMBIA Level 1 qualified (
  • Slipstream 90-Hr Wilderness First Aid (
  • This Canadian specilises in:
    • Foundations of MTBing – Body position (climbing, descending & pumping)
    • Beginner to Intermediate cornering
    • Beginner to intermediate drops
    • Youth after-school programs
    • Givin’r

Mazzy sending big…as she does!!!

Christine “Mazzy” Ma: Another fellow Canadian, specialising in sending it big from the big Whistler tracks. Mazzy has 5 years experience guiding multi-sport tours around Western Canada.

  • PMBIA Level 1 qualified (
  • 80-Hr Wilderness First Responder (
  • Slipstream 90-Hr Wilderness First Aid (
  • Mazzy specialises in:
    • Beginner to Intermediate Cornering
    • Beginner to Intermediate Pumping & drops
    • Encouraging and supportive coaching
    • Sending BIG

Brady Stone: Top of the South local, Brady has been riding since he could walk. With years of race experience, he is up for any trail and any challenge. Sadly for us, he will only be coaching for Gravity until mid-March, before heading overseas to race the EWS.

  • PMBIA Level 1
  • NZQA Level 3 & 4 bike mechanics
  • Triple One Care work place 1st Aid

Brady specialises in:

  • Basics to advanced cornering
  • Body position on technical terrain
  • Techy lines
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