Abdominal exercises are strength exercises that involve the abdominal muscles. They should be left at the end of the workout because the core is used for it. Thus, option 1 is correct.
Abdominal exercises are the ab or the core training of the abdominal muscles and are a type of strength exercise. Abdominal muscles are important as they are required in almost every exercise.
They should be done at the end of the other workout exercises as they require core after which many heavy exercises are not doable. Only light stretching is done after the abdominal exercise.
Therefore, the abdominal exercise must be done at the end.
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