Product Description The SPRI Xertube® is the most effective training tool for pitchers. Safely warms up and strengthens the throwing arm while helping to prevent shoulder injuries. Increases the strength and stamina of your throwing motion on the field. Thirteen different exercises shown in instructional booklet. Available in two resistance levels and includes door attachment. 1
The SPRI Xertube® is the most effective training tool for pitchers. Safely warms up and strengthens the throwing arm while helping to prevent shoulder injuries. Increases the strength and stamina of your throwing motion on the field. Thirteen different exercises shown in instructional booklet. Available in two resistance levels and includes door attachment.