Multiple flex shaft method and system for golf clubs

1. A method comprising:

categorizing a plurality of golf club shafts into a plurality of categories of golf club shafts based on a flexibility of the plurality of golf club shafts,

the flexibility of the plurality of golf club shafts determined, while the plurality of golf club shafts are decoupled from any golf club heads, via a flexibility measurement mechanism configured to apply a predetermined force to the plurality of golf club shafts;

determining a golfing level of an individual being fitted; and

selecting an appropriate category from the plurality of categories of golf club shafts based on the golfing level of the individual;

wherein:

a first shaft flexibility range exhibited within a first category of the plurality of categories of golf club shafts optimized for individuals with a high golfing level is greater than a second shaft flexibility range exhibited within a second category of the plurality of categories of golf club shafts optimized for individuals with a medium golfing level;

the second shaft flexibility range is greater than a third shaft flexibility range exhibited within a third category of the plurality of categories of golf club shafts optimized for individuals with a low golfing level; and

shaft flexibility range differences between the first, second, and third shaft flexibility ranges are substantially consistent relative to each other.

2. The method of claim 1 , wherein:

each of the first, second and third categories of golf club shafts comprises a shaft flexibility variance that is linear.

3. The method of claim 1 , wherein:

each of the first, second and third categories of golf club shafts comprises a shaft flexibility variance that is non-linear.

4. The method of claim 1 , wherein:

a first shaft flexibility range difference comprises:

a difference between the first shaft flexibility range and the second shaft flexibility range;

a second shaft flexibility range difference comprises:

a difference between the second shaft flexibility range and the third shaft flexibility range; and

the first shaft flexibility range difference and the second shaft flexibility range difference are equal to each other.

5. The method of claim 1 , wherein:

the first category of the plurality of categories of golf club shafts comprises a first linear flexure-to-length relationship and a first non-linear frequency-to-length relationship;

the second category of the plurality of categories of golf club shafts comprises a second linear flexure-to-length relationship and a second non-linear frequency-to-length relationship; and

the third category of the plurality of categories of golf club shafts comprises a third linear flexure-to-length relationship and a third non-linear frequency-to-length relationship.

6. A method comprising:

categorizing a plurality of golf club shafts into a plurality of golf club shaft sets based on a flexibility of the plurality of golf club shafts,

the flexibility of the plurality of golf club shafts determined, while the plurality of golf club shafts are decoupled from any golf club heads, via a flexibility measurement mechanism configured to apply a predetermined force to the plurality of golf club shafts;

determining a golfing level of an individual to which a proposed golf club shaft set will be matched; and

selecting the proposed golf club shaft set from the plurality of golf club shaft sets of different golfing levels to fit the golfing level of the individual;

wherein:

the plurality of golf club shaft sets comprises:

a first golf club shaft set with a first shaft flexibility range and configured for a high golfing level;

a second golf club shaft set with a second shaft flexibility range and configured for a medium golfing level; and

a third golf club shaft set with a third shaft flexibility range and configured for a low golfing level;

the first shaft flexibility range is greater than the second shaft flexibility range;

the second shaft flexibility range is greater than the third shaft flexibility range;

the proposed golf club shaft set comprises proposed golf club shafts and a shaft flexibility variance; and

the shaft flexibility variance is consistent from shaft to shaft of the proposed golf club shafts of the proposed golf club shaft set.

7. The method of claim 6 , wherein:

the plurality of golf club shaft sets comprises:

a first shaft flexibility range difference comprising a difference between the first and second shaft flexibility ranges; and

a second shaft flexibility range difference comprising a difference between the second and third shaft flexibility ranges;

and

the first and second shaft flexibility range differences are equal to each other.

8. The method of claim 6 , wherein:

the high golfing level is correlated to at least one of:

a high swing speed; or

a high skill level;

and

the low golfing level correlated to at least one of:

a low swing speed; or

a low skill level.

9. The method of claim 6 , wherein:

an amount of flex for each golf club shaft within the first golf club shaft set is less than an amount of flex for each golf club shaft within the third golf club shaft set.

10. The method of claim 6 , wherein:

each of the first, second and third golf club shaft sets comprises a shaft flexibility variance that is linear.

11. The method of claim 6 , wherein:

the first shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the first shaft set; and

a shaft flexibility of a longest golf club shaft of the first shaft set;

the second shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the second shaft set; and

a shaft flexibility of a longest golf club shaft of the second shaft set;

and

the third shaft flexibility range is determined from a difference between:

a shaft flexibility of a shortest golf club shaft of the third shaft set; and

a shaft flexibility of a longest golf club shaft of the third shaft set.