Which of the following is a promise advertisers cannot make promoting their fitness product?
a. “you can improve your cardio with our three days per week dance lessons.”
b. “you can strengthen your core completing the ab work series.”
c. “target your belly fat to lose weight there first.”
d. “shape and tone with our muscular endurance videos.”

Explanation:

This advertisement is misleading, because losing weight cannot be guaranteed. Just the fact that they promise, though this ad, that you will lose way in burning belly fat is not true, because there are other variables that should be considered.

So, basically, losing weight cannot be assure with some trainer's program, because every person is different.