Is Morning Exercise More Effective?

The video discusses a study on the timing of exercise and its effects on weight loss. Conducted on less than 100 overweight or obese young adults, the study was not a randomized control trial. Participants were grouped based on their exercise timing: early, midday, late, and sporadic. Results showed that early exercisers lost more weight, but the study's limitations mean these findings are not definitive. The video emphasizes that exercise's primary purpose is health benefits, not just weight loss.

Why is it important to note that the study was not a randomized controlled trial?

What is the primary purpose of exercise according to the text, regardless of the time of day?