Does Instrument-assisted Mobilization Influence Healthy, Short Achilles Tendons?

The goal of this clinical trial is to learn if instrumented-assisted soft tissue mobilization (i.e., massage using specialized metal instruments) of the lower leg and Achilles tendon region changes the properties of the tendon and the range of ankle dorsiflexion (i.e., the ability to bring the foot and toes back towards the head). One lower leg and Achilles tendon in each participant will be treated with instrumented-assisted soft tissue mobilization for 7 minutes during 8 treatment sessions over a 4-week period. The other lower leg and Achilles tendon will not be treated and be assessed as the non-treated control leg.