Endurance exercise without weight loss may reduce body fat
medicalxpress.com
medicalxpress.com
On the other hand, it's also quite difficult to ride 700 miles a week in the current socio-economic environment where you have a job other than ride bicycle.
I enjoyed cycling, but once I crossed the 95kg threshold, it became unbearable, due to the rashes I got. Cycling shorts do little to ameliorate it.
Clearly I can't lose the calories I consume from all this crap food by doing sports. The addiction to consume calories is just so strong, it's actively painful not to do it, and the cravings only get stronger the more healthy I try to eat.
I used to be skinny as a teenager, now I can't imagine how it must be for obese people, because I can still run 10+ miles, but I am definitely overweight so it will have effect on my bones like potential stress factures, etc.
I think from exercise the main gains are the happiness hormones, keeping your body healthy and any sort of confidence. It is a basic necessity.
But to actually lose weight and fat, it's still about being able to constrain what you consume.