Our story

Russell Byham

Russell started MiBootcamp because he knows what it feels like to struggle. Growing up overweight, he was bullied for it, until one day he decided enough was enough. He started running every day, taught himself how to train and eat well, and by 16 he had turned his life around.

He has worked in the fitness industry since 2004 and founded MiBootcamp in 2010, on the edge of the Channels estate in Little Waltham. Since then he has helped thousands of people change their lives, built one of Essex’s most loved fitness communities, and led the bootcamp to Best Strength, Conditioning and Functional Training Provider, Essex 2024.

His own journey has not been a straight line. When lockdown shut the bootcamp, he slipped back into old habits and put the weight back on. Getting back on track taught him the lesson at the heart of MiBootcamp’s 12-Week and 12-Month Systems: real transformation is not about perfection. It is about showing up, setting non-negotiables and protecting your energy so you can give your best to the people who need you.

Russell runs the Standard Reset and the Monday accountability meetings, and hosts the Unlock Your Potential podcast. MiBootcamp is the place he wishes he had had growing up, and he built it for you.

Greg Devenish

Greg’s route into coaching is proof that it is never too late to back yourself. He was working behind a bar when he decided he wanted a career he genuinely cared about, and he qualified as a Level 2 Gym Instructor and Level 3 Personal Trainer in 2020, right in the middle of lockdown.

He has been part of MiBootcamp since the start of his coaching career, building his reputation client by client. He has become one of the busiest trainers in the area, finishing 2025 as a top-10 coach for sessions delivered out of more than 80 trainers, and he has even led a group of his clients up Snowdon.

As Head Coach, Greg brings technique, energy and a real passion for movement and mobility to every session. He also runs WellMotion, his own mobility brand. For Greg, the relationships are the best part of the job. He wants you to feel like you belong, and he will help you move better, get stronger and keep showing up.

“In all my years in the industry, Greg has one of the coolest, calmest mentalities I have ever come across. It is the perfect balance to the drive and energy of MiBootcamp, and his values are a real asset to everything we do. Since 2021 he has been a key figure in building our coaching system, and our members are lucky to have him.”

Russell Byham, Founder

Jo Fay

Jo knows the MiBootcamp journey better than anyone, because she has lived it.

As a busy mum of two running her own business, life was always go-go-go. She joined our 6 Week Challenge looking for a change, and over the next 18 months she lost four stone, got stronger and found her confidence again. Chasing after her two boys no longer leaves her out of breath, and she is happy in her own skin.

Jo loved what the bootcamp did for her so much that she wanted to help other people do the same. Today she is the first voice you will hear when you get in touch. She takes your call, gets you signed up and welcomed in, and supports every challenger from week one to the finish line and beyond.

Nervous about starting? Jo is the best person to talk to. She has been exactly where you are.