will this beef up my forearms? also, how is it for waist and leg workouts?

Yes, to forearms. Also, yes to abdominals (waist). Somewhat short for leg workouts, but workable. You will have a full description of all exercises. The best solution is to buy the Steel Bow and the Bow Classic for variety and optimum range of motion.

How much weight resistance is the spring that is already inside of it?

I don't know the exact weight resistance of the spring initially in it but it is VERY soft. Pumping or squeezing and holding this spring is more of an aerobic exercise - expect to be able to do 100 or more. It comes with 2 additional springs that are very easy to change - no tools required. My biggest complaint with the unit is that the progression between springs is extreme. The first one is probably fine since it would be good for weak children and people well into their 70's and 80's. The next level up is quite stiff and resistive requiring some degree of strength. The final spring feels like a steel bar to this 60 year old!

whats the circular rubber pad that comes with the set used for?

exercises that work on your abs, lats, and obliques have you sit on a chair, place one end of the instrument on the chair at various places (between your legs, on the outside of your thigh, etc) and compress the spring with both hands while the steelbow is slightly angled. The rubber pad is used on the table or chair to both protect the surface of the chair (in my case I use a very sturdy coffee table) and to help prevent the handle on the chair or table from slipping. I hope this helps.

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Steel Bow 20" Portable Home Gym Exercise Equipment Isometric Exercise Equipment for Arms, Chest, Back, Shoulders, Core, Biceps, Triceps, Abs - Strength Training Equipment

Product ID: 9257038

Details

Brand
Bullworker
Color
Matte Black
Item Weight
1 kg
Material
Aluminum
Model Name
Steel Bow

🎒20" compact portable design

💪66% faster strength gains

⚙️5 variable resistance springs

1826.25 DT

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Description

💥 Power Up Anywhere: Strength Training Meets Portability!

ULTIMATE PORTABILITY - Compact 20" design and included carry case let you train anywhere, anytime.
PREMIUM CRAFTSMANSHIP - Durable laser-etched aluminum and ergonomic handles ensure safe, effective sessions.
ACCELERATE STRENGTH GAINS - Achieve up to 66% faster muscle growth with proven isometric training.
JOINT FRIENDLY RESISTANCE - Adjustable springs provide smooth, low-impact workouts for all fitness levels.
PRECISION MUSCLE TARGETING - Versatile isometric exercises sculpt arms, chest, back, shoulders, core, and legs.

The Bullworker Steel Bow 20" is a premium isometric strength training device featuring 5 adjustable resistance springs, laser-etched aluminum construction, and a compact design for portable full-body workouts. It delivers up to 66% faster strength gains compared to traditional weightlifting, targeting multiple muscle groups with low-impact precision. Ideal for home or on-the-go fitness, it includes a luxury carry case and detailed routines, backed by a 5-year warranty.

Specifications

ASIN	B000LQKABM
Archery Draw Length	51 centimeters
Archery Draw Weight	58.97 kg
Best Sellers Rank	#209,859 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #194 in Strength Training Upper Body Machines
Brand Name	Bullworker
Color	Matte Black
Customer Reviews	4.6 4.6 out of 5 stars (746)
Global Trade Identification Number	00896529000016
Hand Orientation	Ambidextrous
Included Components	5 Interchangeable Variable Resistance Springs, Instruction Manual and 90 Day Routine, Luxury Canvas Carrying Case, Non-Slip Pad
Item Type Name	Isometric Strength Training Exercise Device
Item Weight	1 kg
Manufacturer	Bullworker
Manufacturer Part Number	896529000016
Material Type	Aluminum
Model Name	Steel Bow
Model Number	896529000016
Number of Items	1
Size	20"
UPC	896529000016
Unit Count	1 Count
Warranty Description	5 Years

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1826.25 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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