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I got introduced to elastic band exercises when I went to physical therapy for slumped shoulders and a forward head from spending too much time at a computer with bad posture or bad Workstation Ergonomics.
This training goes by Elastic resistance training (ERT), Resistance Bands, exercise Bands, ...

They are used for Exercise, Physical Therapy, Lower Pilates, At-Home Workouts, and Rehab.

 Resistance Tubing    Resistance/Exercise Bands    Resistance Band Loops

Flat Resistance Bands vs Tubes: How to Choose | BestrResistanceBands.net

 Resistance Tubing:
Also referred to as resistance tubes, workout bands, strength bands, stretch bands and training bands. Most tubes are 4 ft total, 2 ft for each arm. (Note: They are 5-6' (2.5-3' per arm) at my Physical Therapy Gym) Movements typically range from 2 ft to 3.5 ft for me at 5-8 tall. Thats 100% to 175% elongation. Note: Colors, designations and weights vary by manufacturer
Color Designation Resistance
Dimensions Resistance
lbs *
100% 200%
Tan Extra thin 2.4 3.4
Yellow Thin Minimal 1/8" 3.0 4.3 Rehab, Seniors
Red Medium Moderate 3/16" 3.7 5.5 Beginners
Green Heavy Moderate Plus 5/16" 4.6 6.7 Average fitness
Blue X-Heavy Maximal Minus 3/8" 5.8 8.6 Already fit, active
Black Special Heavy Maximal 7/16" 7.3 † 10.2 Experienced, strong users
Silver Super Heavy Maximal Plus 9/16" 10.2 15.3
Gold Max 14.2 21.3
† - My measurement at my Physical Therapy office with used
The inside diameter is the same and they have thicker walls for heavier resistance.
Thera-Band Tubing, diameter, weight designation | SchoolHealth.com
Thera-Band Colors Sequence Resistance Levels - ProHealthcareProducts.com
Other stat sources below
Note: Color-coding is not standard for all bands

* 100% means stretched to double length, 200% = 3x resting length
 BMP  Single bands 5 Band Set
 Yellow (2-4 lbs.), 
 blue   (4-6 lbs.), 
 green  (10-12 lbs.), 
 black  (15-20 lbs.)  
 Red    (25-30 lbs.)
 orange (30-35 lbs), 
 purple (45-50 lbs),   My measurement 36# at 100%, 60# at 200% *
 atomic (70-75 lbs). 
 * Assume ratings are for pulling on a doubled band, so it's twice that of a single band.

Strength Training with Resistance Bands - Fit Simply Article
  Color  Level  Estimated Poundage
Yellow Extra Light 2-4 lbs
Blue   Light       4-6 lbs
Green  Medium     10-12 lbs
Black  Heavy      15-20 lbs
Red   Extra Heavy 25-30 lbs

Note: Fit Simply Tube Set has different colors and weights
Yellow (5-10 lbs), 
Red    (15-20 lbs) 
Green  (20-25 lbs)
Black  (25-30 lbs)
Blue   (30-45 lbs)

You can also get Thera-band tubes in 25 ft lengths

X-Light, Pink        - 30 lbs.  Light/Heavy, Red - 60 lbs.
Medium/Heavy, Yellow - 70 lbs.  Heavy, Green     - 80 lbs.
Light, Magenta       - 40 lbs.  X-Heavy, Navy    - 90 lbs. 
Medium, Orange       - 50 lbs.

What Is the Difference in Colored Resistance Bands? | Healthy Living

Latex Resistance/Exercise Bands
Resistance Bands Loops
Top 10 Best Resistance Bands for Workouts 2018 | Heavy.com
Dumbbells vs. resistance bands
What Is the Difference in Colored Resistance Bands? | Healthy Living
Strength Training with Resistance Bands

Stats (color, weight, size):
Workoutz Wholesale - Basic Resistance Tube

Where to get bands:
Exercise Bands | Amazon.com
Amazon.com: TheraBand Professional Latex Resistance Tubing For Upper Body, Lower Body, Core Exercise, Physical Therapy, Lower Pilates, At-Home Workouts, and Rehab, 25 Foot, Black, Special Heavy, Advanced Level 1: Industrial & Scientific
Resistance Bands | Fitness Health
Amazon.com : Fitness Insanity - Resistance Band Set - Include 5 Stackable Exercise Bands with Waterproof Carrying Case, Door Anchor Attachment, Legs Ankle Straps and Exercise Guide Ebooks

Resistance Band Workouts | Health And Fitness Training | BooksWorkout.com
11 Resistance Band Exercises for Shoulder Flexiblility and Strength | Examined Existence

last updated 1 Feb 2018