What it the bow extension referred to in the description

The Bow Extension is also known as the Iso-Core, extension straps, and or Iso-Core Straps.

I know the picture is the new s3 classic but other pictures show the old model. which one is amazon selling

Amazon is selling our new S3 models in the UK. Thanks!

We have the Bullworker but no instruction booklet, Im sure that there should be one

Yes you should have an instruction booklet. Ask for one and download a PDF while you are waiting.

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Description

💥 Sculpt smarter, not harder — your portable powerhouse awaits!

ISOMETRIC POWER BOOST - Build muscle 66% faster than traditional lifting with science-backed isometric training.
CUSTOMIZABLE RESISTANCE - Five springs let you dial from beginner to beast mode with up to 150 lbs.
ALL IN ONE FITNESS COMPANION - Back, chest, arms, abs—complete routines and a carrying case included for on-the-move gains.
EFFORTLESS STRENGTH ANYWHERE - No setup, just grab & go for instant full-body workouts.
SLEEK DURABLE CRAFTSMANSHIP - Laser-etched aluminum and ergonomic handles for smooth, comfortable sessions.

The Bullworker Bow Classic 90cm is a premium portable isometric exercise device featuring 5 variable resistance springs delivering up to 150 lbs. Crafted from durable aluminum with ergonomic handles, it offers a full-body workout targeting back, shoulders, chest, arms, and abs. Designed for all fitness levels, it accelerates muscle gains up to 66% faster than traditional weightlifting and includes a carrying case, workout routines, and fitness journal for seamless training anywhere.

Specifications

Handle type	Fixed Handle
Maximum weight recommendation	160 Pounds
Global Trade Identification Number	00896529000009
UPC	896529000009
Color	Sleek Black
Size	90 CM
Hand orientation	Right Hand
Item display length	36 inches
Weight	1.36 kg
Material type	Aluminium
Number of items	1
Included components	5 Interchangeable Variable Resistance Springs, Canvas Carrying Case, Non-Slip Pad, User Manual, Fitness Journal and 90 Day Routine
Batteries included?	No
Department	Unisex
Manufacturer	Bullworker
Item model number	Classic
Product Dimensions	54.99 x 14 x 5.99 cm; 2.5 kg
ASIN	B001I1K6E0

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