You tell them the truth - whether or not you have the stamina to perform the job.
Stamina is the capacity of a person to endure physical stress to achieve some objective 'OR' The physical endurance of a person.
Stamina is more about strength, and endurance is more about time. Stamina is focused on how long a group of muscles can perform at maximum capacity. Endurance is focused on the amount of time a group of muscles can perform a certain action.
run
A ballet performance is an exercise in extreme athletics, and dancers must be superb physical condition with excellent stamina. Stamina is a function of physical conditioning. By the time one becomes a dancer, one has it.
Endurance and the ability to withstand pain and other interferences eg. She has good stamina
strenght and stamina
There is no adjectival form of the noun stamina. You would have to recast your sentence. For example:'My friend had enormous stamina when she was running the marathon.''I have noticed that David's stamina has decreased over the past few months.'If you are taking the word stamina to mean high stamina (as opposed to being just a neutral synonym for staying-power, with no indication of how much of it the person in question has), and you want an adjectival equivalent, you could perhaps use powerful or energetic, although they are not exact synonyms.
Stamina is your ability to withstand physical and mental effort. For example, athletes have very good physical stamina as they are able to compete in sports for very long periods of time. Other people might do very well in long exams as they have good mental stamina. If you have bad stamina, you might find yourself getting tired quickly as the result of straining yourself either physically or mentally.
as your physical stamina increases
Stamina is your endurance. For example, the more you run, the longer your stamina will be. It relates to fitness because the more stamina you have, the longer you'll be able to participate in athletic activities.
Stamina.
stamina, strength, flexibility, healthy body, composition