i run 40-0 mins a day but i wanna lose weight...i was wondering is it better to vary the speed and run without incline or should i incline my treadmill...because incline gives you more of cardio but im not sure how it works for weight loss...
thank you for your help

running with the incline on activates your core more and simulates running outside on the street than running on a flat surface. activating your core will lead you to better performance in aerobic activities in the long haul.
having a strong core also makes your mid-section flatter.
if you want to incorporate weight loss into your treadmill workout then start running at intervals, i.e. run at 80-90% of you maximum for 30sec and then 50-60% of your max for 30s and repeat for 10- 15 mins. of you could run for 20- 30 mins alternating between 65 and 75% for 1 min each. ie if your run at 6.5 comfortably for 30 mins then run @ 6.3 an 6.8 at 1 min each.

any kind of running works for weight loss.
running on an incline just builds the leg muscles faster than running flat.
youll have stronger hamstrings thighs and glutes. and youll definitely lose weight.
sometimes lay it flat and run farther than on incline for more of an endurance and weight loss approach.
on high incline, youll still lose weight, but your legs and butt will get stronger too. you might not be able to go as far.
just vary it
and remember muscle ways more than fat so if your running on an incline and building leg muscle you wont lose as much

i think its betta wen the treadmills just flat, and ur running quite fast, thats good for weightloss..