My Greatist Routine asks fitness, health, and happiness all-stars how they stay on top of their game. Find the complete series here.

Kelvin Gary, former engineer and finance professional turned personal trainer, kicks clients’ butts with battleropes, sandbags, and kettlebells. Though he’s no longer crunching numbers daily, Kelvin uses his analytical mindset to tackle the human body, with his favorite tool: the kettlebell. Outside of the gym, it’s 30 to 50 mile bike rides plus plenty of charity miles at the Livestrong Challenge and the Bike MS City to Shore Ride (175 miles!). Read on to see what else makes Kelvin a greatist.

To learn more about Kelvin, visit and follow him on Twitter at @KelvinGary and on Instagram at @KelvinGary.

Are you a greatist, too? Tell us about your #imagreatist healthy habits and routine in the comments below.

Photo courtesy of Kelvin Gary; Design by Bob Al-Greene