meaning of 'form of aerobic activity for a cardiovascular workout'

[Zoi]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #315 "Health and Nutrition Questions Test (1)", question 2

In addition to muscle building exercises, most trainers will recommend some form of ......... for a cardiovascular workout.

(a) lifting weights
(b) protein shake
(c) aerobic activity

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #315 "Health and Nutrition Questions Test (1)", answer 2

In addition to muscle building exercises, most trainers will recommend some form of aerobic activity for a cardiovascular workout.

Correct answer: (c) aerobic activity
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why?

Zoi

[Mister Micawber]

.
Because aerobic exercise works the cardiovascular (heart and circulation) system, something which neither A nor B do.
.
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Native English teacher at Mister Micawber's