Flexibility
Flexibility is how much range your tissues and joints allow.
Flexibility: a practical example
For example, a hamstring stretch explores the available movement around the hip.
Use it in your log
When you log your workout, keep this in mind: available range and the ability to control that range are related but different.
Next, use the workout log to keep names, weights and reps in one place. Then check your progress across sessions.
Related terms
These examples explain terms. They do not tell you what to lift. If you need help with a plan, ask a qualified trainer.
Updated October 22, 2026. For more context, read the ACSM training guide (2009). However, terms can vary by plan.