The most logical answer would be for lack of time. Cardio takes longer to burn more calories. You would have to walk an hour to burn 160-180 calories (for 130 pound person). An alternative would be HIIT which burns more calories in a short period of time.
Researchers can now see actual thought processes by measuring the increases of blood flow and oxygen to different sections of the brain.
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Answer:
Hypothesis
Explanation:
Hypothesis is more than a wild guess but less than an established evidence.
Here you have no evidence why. your friend snubbed you so it's still a hypothesis.