the cubby. life Say hi →
Jay Siva · Singapore · Est. 2025 · Vol. I

I train
humans &
build companies.

Part coach, part operator. Mornings on the gym floor with the people I work with. Afternoons in spreadsheets, supplement labels, and license queues. This is where the two halves live — and where I write down what I'm learning between them.

Coach
·
Operator
·
Writes things
Say hello → See what I'm building
one life, two halves ↓
Fig. 01 · On the floor
This morning's notes — train — build — write — rest — repeat in that order. keep stacking.
Fig. 02 · The pattern
Singapore
Fig. 03 · Home base
built in singapore · coached in the iron · written in the margins · one life, two halves · one rep at a time · built in singapore · coached in the iron · written in the margins · one life, two halves · one rep at a time ·
/01
What I do, in three columns.
Chapter · One of four
1.

Train

One-to-one coaching out of Platinum Fitness, Singapore. Strength, hyrox-adjacent conditioning, and the boring aerobic work nobody else wants to program.

cubbytrains.com →
In-person · Online · Hybrid
2.

Build

Kozen-X — supplement aggregator, the honest shelf for Asia. Cubby Labs — premium DTC supplement brand, in planning. Quiet companies that earn their keep before they go loud.

kozen-x.com →
Two entities live · One in planning
3.

Write

Notes from the gym, the spreadsheet, and the license queue. Driving licenses, supplement labels, ADHD operating systems. Long-form here. Short clips on YouTube.

read the notebook →
No hustle posts · Free
Dateline · May 2026

Right now.

Training
Base block for Hyrox Chiba in August. Row + bike dominant, low-impact running, plenty of zone-2.
Building
Cubbytrains.com intake live. Kozen-X site shipped. Cubby Labs in planning.
Filming
Class 2A motorcycle license practical block. Filming the whole run — same playbook as the Class 2B series.
Reading
Aesop's copy archive. Munger annual letters, obsessively. Too many supplement labels.
More on the now page →
/02
Ventures, quietly compounding.
Chapter · Two of four
Active
Personal training for people who are tired of guessing.
Singapore-based 1:1 strength + conditioning. In-person, online, and hybrid programming.
Coachingcubbytrains.com →
Pre-launch
The honest shelf. One search, every retailer, best price wins.
Supplement aggregator with a live price graph as the moat. Affiliate revenue, zero inventory.
App + Webkozen-x.com →
In planning
Evidence. Not hype. Premium DTC supplements for Southeast Asia.
Early planning. SKUs, formulations, and timing all in flux. More public details when there's something to show.
DTCcubby-labs.com →
"One life. Two halves. Zero wasted reps."
Jay Siva · The Cubby Life · 2026
/03
Watch.
Chapter · Three of four · YouTube
Class 2B Singapore: The COMPLETE Guide
Driving · 24:30

Class 2B Singapore: The COMPLETE Guide Nobody Told You About (2025/2026)

YouTubewatch →
Class 2B Traffic Police Test breakdown
Driving · 17:32

Class 2B: Traffic Police Test — Full Breakdown (2025)

YouTubewatch →
Class 2B Lesson 5 Test Route Cheat Sheet
Driving · 40:51

Class 2B: Lesson 5 — Test Route, Full Cheat Sheet (2025)

YouTubewatch →
Class 2B Lesson 6,7 Road Route Full Guide
Driving · 30:24

Class 2B: Lesson 6, 7 — Road Route, Full Guide (2025)

YouTubewatch →
Class 2B Lesson 8 The Last Step
Driving · 7:41

Class 2B: Lesson 8 — The Last Step (2025)

YouTubewatch →
Class 2B Lesson 5 Quick Summary
Driving · 5:52

Class 2B: Lesson 5 — Quick Summary (listen before test)

YouTubewatch →
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