Exercise has a lot of great benefits even though it's effect on weight loss is rather minimal. One of the biggest reasons I personally work out is for the ability to learn faster. Exercise gives you more Brain Derived Neurotrophic Factor (BDNF) which "improves the function of neurons, encourages their growth, and strengthens and protects them against the process of cell death."

"WHY Exercise is so Underrated (Brain Power & Movement Link)" https://www.youtube.com/watch?v=DsVzKCk066g

"We found that vocabulary learning was 20 percent faster after intense physical exercise as compared to the other two conditions." https://www.ncbi.nlm.nih.gov/pubmed/17185007