Questions about running/speed walking/weight loss?

ok. so, background story.
I Usually run for about half hour, on the treadmill, at about 8mph. (along with other cardio)
my new agent said that running is giving me strong/too big thighs, so i need to power walk. So i have been power walking the last 3 days, at about 5.5 mph. so my qs:
`will i even lose weight? i mean, im def working up a sweat, but i feel like 5.5 is sooo much less than 8! and it WALKING
~i still feel the burn in my thighs. So doesnt that mean theyre still getting bulky?
~i read somewhere that sprinters have big legs because of something called "fast threads" or something. If i do sprints on the treadmil, like walking at 5.5, then every 5 minutes sprinting at 9 for 1 minute, will i get big thighs?

i thiiiink thats all. thank you so much!

Yes, you will lose weight but at a slower pace than when you were running.

You are using different muscles and the same muscles differently so there will be the burn of muscles unaccustomed to exercise or that form of exercise.

Sprinters have fast twitch muscle fibers, distance runners have slow twitch muscle fibers. The fast twitch fibers allow the sprinters to run fast and the slow twitch allow the distance runners to run far. Most people have a mix of both.

Muscles get big by exerting force and neither running nor walking lead you to exert sufficient force that your legs would start to get larger. They may look more toned but that would be from weight loss, the loss of fat that was covering the muscle which would expose it more.

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