CSCS Flexibility & Mobility Training 2 — Questions and Answers
Question 1: According to NSCA recommendations, how long should a static stretch be held to effectively improve range of motion?
- 5–10 seconds
- 15–30 seconds (Correct answer)
- 60–90 seconds
- 2–5 minutes
Correct answer: 15–30 seconds
The NSCA recommends holding static stretches for 15–30 seconds per repetition as sufficient to produce ROM improvements while minimizing acute performance decrements.
Question 2: The muscle spindle's primary role in flexibility is to:
- Detect sustained tension at the musculotendinous junction and cause relaxation
- Detect rapid changes in muscle length and trigger a protective stretch reflex (Correct answer)
- Regulate core temperature during sustained aerobic exercise
- Signal fatigue during high-rep resistance training
Correct answer: Detect rapid changes in muscle length and trigger a protective stretch reflex
The muscle spindle (intrafusal fiber) responds to rapid muscle lengthening by initiating the myotatic (stretch) reflex, causing the muscle to contract and resist further stretch.
Question 3: Which stretching modality generally produces the GREATEST acute improvements in range of motion?
- Static stretching
- Ballistic stretching
- PNF stretching (Correct answer)
- Dynamic stretching
Correct answer: PNF stretching
PNF stretching consistently produces the largest acute gains in ROM by combining isometric muscle contractions with passive stretch, leveraging both autogenic and reciprocal inhibition.
Question 4: Ballistic stretching is characterized by:
- Slow, controlled movement held at end range
- Rapid, bouncing movements that use momentum to exceed the normal range of motion (Correct answer)
- A partner applying sustained overpressure at end range
- Isometric co-contraction of agonist and antagonist simultaneously
Correct answer: Rapid, bouncing movements that use momentum to exceed the normal range of motion
Ballistic stretching uses rapid, repetitive bouncing movements to force the limb beyond its normal range, which can activate the stretch reflex and increase injury risk.
Question 5: An athlete standing on one leg and pulling the opposite foot toward the glutes to stretch the quadriceps is an example of:
- Passive flexibility
- PNF hold-relax technique
- Active (dynamic) flexibility (Correct answer)
- Ballistic stretching
Correct answer: Active (dynamic) flexibility
Using one's own muscular force to achieve and hold a stretched position without external assistance is classified as active flexibility.
Question 6: Reciprocal inhibition, as applied to stretching, involves:
- Relaxation of the agonist due to GTO activation during sustained tension
- Contraction of the agonist causing neural inhibition of the antagonist, allowing it to stretch further (Correct answer)
- Both agonist and antagonist contracting simultaneously to stabilize the joint
- The myotatic reflex activating during rapid ballistic movements
Correct answer: Contraction of the agonist causing neural inhibition of the antagonist, allowing it to stretch further
Reciprocal inhibition occurs when the agonist contracts, and the nervous system inhibits the antagonist, reducing its resistance and allowing greater elongation during stretch.
Question 7: The NSCA recommends flexibility training should occur with a minimum frequency of:
- Once per week for sedentary individuals only
- At least 2–3 days per week for general ROM improvement (Correct answer)
- Every day without exception for all populations
- Only during defined deload weeks in a periodized plan
Correct answer: At least 2–3 days per week for general ROM improvement
NSCA guidelines recommend stretching at least 2–3 days per week to achieve meaningful and lasting improvements in range of motion across most populations.
CSCS Flexibility & Mobility Training 2
According to NSCA recommendations, how long should a static stretch be held to effectively improve range of motion?