Use the Original XertubeÂ® to isolate targeted muscle groups through a full range of motion to strengthen and tone arms, chest, shoulders, and back. This versatile tool is perfect for group exercise, personal training, and even travel. The progressive resistance levels also make this tool ideal for all fitness levels. Heavy-duty, high quality tubing resists tears and abrasions.Â Available in color-coded resistances ranging from very light to ultra heavy. The very light resistance is also available with soft handles for a more comfortable resistance training workout. Sold individually. Includes a downloadable exercise guide.