1. Assessment
1.1. Shooting performance
1.1.1. Maximum score: 600
1.2. Balance ability
1.2.1. Dynamic balance
1.2.1.1. Star excursion balance test
1.2.2. Static balance
1.2.2.1. Center of pressure
1.2.2.1.1. 95% ellipse area
1.2.2.1.2. Speed
1.2.2.1.3. Excursion
1.2.2.1.4. Mean distance
1.3. Shooting variables
1.3.1. Aiming accuracy
1.3.1.1. Center of gravity(hit)
1.3.1.1.1. Maximum score: 10.9
1.3.2. Stability of hold
1.3.2.1. Deviation in X axis
1.3.2.2. Deviation in Y axis
1.3.3. Cleanness of triggering
1.3.3.1. ATV
1.3.3.2. RTV
2. Core Stability
2.1. Three systems
2.1.1. Active: Muscular system
2.1.2. Passive: Bony structures and ligaments
2.1.3. Neuromuscular control system
2.2. Beneficial for athletics
2.2.1. Improve static balance ability
2.2.2. Improve dynamic balance ability
2.2.3. Improve trunk muscle performance
2.2.4. Improve sports performance
2.3. Training method
2.3.1. Duration: 20 min/training session
2.3.2. Frequency: 2 times/week
2.3.3. Total: 6weeks
3. Competition rules and regulations
3.1. Duration
3.2. Equipment
4. Factors affect shooting performance
4.1. Emotional factors
4.1.1. Anxiety
4.1.2. Depression
4.1.3. Nervous
4.2. Postural balance
4.2.1. Center of pressure
4.2.1.1. Antero-posterior direction
4.3. Upper limb stability
4.3.1. Muscular tremor
4.3.1.1. Horizontal direction
4.4. Quiet eyes motion
5. Hypothesis
5.1. At least one of the pairwise comparisons is not equal
5.1.1. Shooting performance
5.1.1.1. Maximum score: 600
5.1.2. Balance ability
5.1.2.1. Center of pressure values
5.1.3. Shooting variables
5.1.3.1. Aiming accuracy
5.1.3.2. Stability of hold