Online College Courses for Credit

Muscle Building

Muscle Building

Author: Nathan Lampson

This lesson will describe the effects that exercise has on your muscles.

See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

29 Sophia partners guarantee credit transfer.

311 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 27 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Terms to Know
Aerobic Exercise

A type of physical activity that gradually conditions slow muscles to work for longer periods of time.


A substance found naturally in muscles or used as a supplement to replenish ATP during muscle workouts allowing muscles to sustain activity for longer periods of time.


A pigment that binds oxygen for the use of ATP production.

Strength Training

A type of physical activity that increases the size of the muscles and has an affect mainly on fast muscle fibers.