Not too strong, but keeps on keeping on!

Think of slow twitch muscle fibers like a tortoise:  They are not particularly fast, but they do keep on going.  Slow twitch motor units have some common characteristics.

Slow twitch muscles come in handy for any activity in which endurance is essential.  Some muscles have a higher proportion of slow twitch fibers.  For example, the soleus muscle, which is in the lower leg and is important for standing, has a high proposition of slow twitch fibers.  In addition, because the nerve only connects to a few fibers, slow twitch motor units are usually associated with fine motor skills like blinking.