initiating rotation while airborne 1. reaction rotation 2. cat rotation 3. twist from a somersault

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Initiating Rotation while Airborne 1. Reaction Rotation 1. Reaction Rotation 2. Cat Rotation 2. Cat Rotation 3. Twist from a somersault 3. Twist from a somersault

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Page 1: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Initiating Rotation while Airborne

1. Reaction Rotation1. Reaction Rotation

2. Cat Rotation 2. Cat Rotation

3. Twist from a somersault3. Twist from a somersault

Page 2: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Reaction Rotation to Initiate Twist Rotation while airborne L is constant and while airborne L is constant and ΣΣT = 0T = 0 rotation action in one direction causes a rotation rotation action in one direction causes a rotation

reaction in the opposite directionreaction in the opposite direction 360° full turn/twist requires 8 series of steps 360° full turn/twist requires 8 series of steps

alternating alternating II during arm swing/recovery during arm swing/recovery HJ clearing trailing body parts [straddle, flop]HJ clearing trailing body parts [straddle, flop]

Page 3: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Cat Rotation to Initiate Twist Rotation

Page 505 FIG 15.8

Page 503 FIG 15.6

Page 4: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Cat Rotation to Initiate Twist Rotation

1.1. A.A. place lower & upper place lower & upper axes at an axes at an

2.2. B.B. twist upper body, lower twist upper body, lower body has small reaction body has small reaction

3.3. C.C. twist lower body, upper twist lower body, upper body has small reactionbody has small reaction

page 505 FIG 15.8

180180° ° half turn/twist requireshalf turn/twist requires3 steps as follows:3 steps as follows:

Page 5: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Somersaultto Initiate a Twist

1.1. from symmetrical position, from symmetrical position, initiate layout back sommieinitiate layout back sommie(establish (establish LL about ML axis) about ML axis)

2.2. move to asymmetrical move to asymmetrical position [drop rt. arm]position [drop rt. arm]

page 506 FIG 15.9

- this reduces - this reduces II on rt. side of body on rt. side of body about ML axis on that about ML axis on that sideside

- nutation (tilt of body) results - nutation (tilt of body) results and a twist beginsand a twist begins

Page 6: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Somersault to Initiate Twist Rotation most effective of the 3 methods of initiating a most effective of the 3 methods of initiating a

full twist (360full twist (360°)°)

multiple twists (720multiple twists (720° rotation or more)° rotation or more), , performer usually initiates some of the twist performer usually initiates some of the twist from the ground (Ffrom the ground (Freactionreaction) in addition to the ) in addition to the airborne maneuversairborne maneuvers

(symmetrical to asymmetrical during the (symmetrical to asymmetrical during the somersault action)somersault action)

Page 7: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

“Kicker” ramp places body

in position for g to apply a T

to initiate a back sommie

Page 8: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Left photo

symmetricalsymmetrical

Right photo

asymmetricalsymmetrical

Page 9: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Altering k: radius of gyrationpage 511

FIG 15.13

atight tuck

elayout

Page 10: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Altering k - radius of gyration

TABLE 15.1 on page 510TABLE 15.1 on page 510- read across from left to right- read across from left to right

Example from Table 15.1:Example from Table 15.1:

moving from position moving from position aa to position to position ee diminishes by almost 75 diminishes by almost 75 [from 1.00 to 0.28] [from 1.00 to 0.28]

Page 11: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Manipulating Rotations in Sport

Page 12: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Manipulating Rotations in Sport

Page 13: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Manipulating Rotations in Sport

page 515

FIG 15.17

Page 14: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Manipulating Rotations in Sport

More elongated = Slower Rotation about ML axisLess elongated body = Faster RotationReaction Rotation to Clear Trailing Body Parts

Page 15: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Gymnastics Tumbling Skills

Less Skilled Highly Skilled

low vlow vvertvert due to: due to: power + power + takeoff takeoff

less air timeless air time low low due to:due to:

power + power + I @ takeoff I @ takeoff largerlarger k in flightk in flight

high vhigh vvertvert due to: due to: power + power + takeoff takeoff

more air timemore air time high high due to:due to:

power + power + I @ takeoff I @ takeoff smallersmaller k k in flightin flight

Page 16: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

Sample Tape: Aid in Prep for Test 1 copy of a sample tape located in each of the 2 video 1 copy of a sample tape located in each of the 2 video

viewing booths (VCR in middle booth not working) viewing booths (VCR in middle booth not working)

booths located in Thames Hall room booths located in Thames Hall room 2120A across 2120A across the hall from the Computer Labthe hall from the Computer Lab

each booth can hold up to 3 personseach booth can hold up to 3 persons

Page 17: Initiating Rotation while Airborne 1. Reaction Rotation 2. Cat Rotation 3. Twist from a somersault

ABOUT THE VIDEO EXAM

1.1. Exam held in Natural Science Room 145 Exam held in Natural Science Room 145

2.2. Video Exam is 45 minutes long coveringVideo Exam is 45 minutes long covering

3.3. 9 skills, 3 questions per skill (n=27 questions)9 skills, 3 questions per skill (n=27 questions)

4.4. 5 minutes allowed to answer 3 questions per skill5 minutes allowed to answer 3 questions per skill

5.5. Exam Value 25% of final course gradeExam Value 25% of final course grade