Is doing treadmill for 30 minutes('x' min) once a day equal to doing it for 15 minutes('x/2' min) twice a day?

Question

if not, which is better and why?

Answer 1

it really depends on the level of intensity that is used. in order for them to be equal you would have to perform the same amount of work in an equal amount of time. if you can travel say 8 miles in 30 minutes then each 15 minute session you would have to travel 4 miles.