Design Pattern for dealing with a complex conditional evaluation

I am designed to maintain a system that takes in account the value of three variables to determine which action it will take.

I want to refactor it to use a design pattern, but could not find one suitable for it needs.

To explain the situation, I will use as an example a gym system.

Every gym user has a TYPE_OF_CONTRACT, that could be:

• PLATINUM_MEMBERSHIP
• GOLD_MEMBERSHIP
• SILVER_MEMBERSHIP

The gym has some GYM_CLASSES:

• WEIGHT_LIFTING
• BODY_BALANCE
• STEP
• SPINNING
• ZUMBA
• PERSONAL_TRAINING

Every gym user has a PHYSICAL_CONDITION

• NO_RESTRICTIONS
• OVER_65
• LIMITED_MOBILITY
• MEDICAL_CONDITION
• BELOW_18

For each combination of these three characteristics, a arbitrary set of actions should be executed. For example:

if PLATINUM_MEMBERSHIP + PERSONAL_TRAINING + OVER_65:

1. medical approval needed
2. signed form

if GOLD_MEMBERSHIP + PERSONAL_TRAINING + OVER_65:

1. medical approval needed
2. signed form
3. extra monthly fee

if SILVER_MEMBERSHIP + PERSONAL_TRAINING + OVER_65:

1. refuse subscription

if (any membership) + STEP + MEDICAL_CONDITION:

1. medical approval needed
2. signed form

if PLATINUM_MEMBERSHIP + WEIGHT_LIFTING + LIMITED_MOBILITY:

1. medical approval needed
2. signed form
3. dedicated staff member assist

And so on.

The combination of characteristics can have a set of actions, that are not exclusive and not all of the combinations are ensured.

The legacy code uses nested switches as implementation. Example:

switch (contractType):

    case PLATINUM_MEMBERSHIP:

        switch (gymClass):            

            case (PERSONAL_TRAINING):

                switch (physicalCondition):            

                    case (OVER_65):

                        requiresMedicalApproval();
                        requiresSignedForm();

...

My problem is:

• there are 3 conditions that combines to define a set of rules;
• these rules are not necessarily unique;
• not every combination defines a set;

I refactored a little using extract method technique and cleaning the code a little, but could not get rid of the 3 switches.

I wish to use design patterns to improve the design but so far I was unsuccessful.

I thought about polymorphism and Strategy, but could not figure a way to use any of them.

I also researched in google but haven't found anything that I could use.

What do you suggest?

Thank you.