// Sunday Engine Builder
B.I.G. Engine & Body Shop in West Roxbury
B.I.G. Engine & Body Shop is Boston Iron Grit's Sunday conditioning class in West Roxbury — developed by Coach B to meet the long cardiovascular endurance element of training. Each 30–45 minute workout brings lifting, gymnastics and cardio together; every week is unique and never dull. Sundays at 8:00 and 10:00 AM.
// Who it's for
This program fits you if…
- Athletes who want a bigger aerobic engine
- HYROX racers building long, steady capacity
- Members who love a fun, testing Sunday sweat
- Anyone bored of the same cardio routine — every workout is unique
// Inside a session
What a typical session includes
Briefing & Warm-Up
10 minCoach B walks through the day's unique combination and pacing plan.
The Engine Block
30–45 minLifting, gymnastics and cardio blended into one long endurance piece.
Cool-Down
10 minZone 2 flush and mobility to finish.
B.I.G. Engine & Body Shop — FAQs
A Sunday conditioning class developed by Coach B that blends lifting, gymnastics and cardio into a 30–45 minute endurance workout. It has become one of our most popular classes.
Yes — like everything at Boston Iron Grit, every element scales to your level while keeping the intended stimulus.
Absolutely. The long cardiovascular endurance element is exactly what HYROX racing demands — many of our HYROX athletes anchor their week with it.
The workout itself runs 30–45 minutes inside a one-hour class, and every week is different.
// Talk to a Coach
Interested in B.I.G. Engine & Body Shop?
Tell us a little about you and a coach will be in touch to help you get started — usually the same day.
Prefer to talk now? Call or text 617-637-8900
Not sure where to start?
Book a free goal review — a 20-minute conversation about your goals, history and the right first step. No pressure, no obligation.