They say that weight loss is nothing but *creating a calorie deficit*. So any activity you do + dieting that amounts to a significant calorie deficit each day should result in weight loss.
But they also say that if you do the same activity everyday, you might plateau after a while because muscles need different types of challenge for you to keep losing weight.
I'm confused at the second statement. Why should it matter to you if same activity is done each day as long as it creates a calorie deficit?