Can You Go?: Assessments and Program Design for the Active Athlete and Everybody Else

by Dan John

tonic, which tend to shorten when tired (or old!), and phasic, which tend to weaken under stress (or age, I dare say). Tonic Muscles (Shorten) Phasic Muscles (Weaken) Upper Trapezius Rhomboids Pectoralis Major Mid-back Biceps Triceps Pectoralis Minor Gluteus Maximus Psoas Deep Abs Piriformis External Obliques Hamstrings Deltoids Calf Muscles