Does walking really help with easy labour? Anyone who didn't exercise or walk had any issues?

I am active generally cooking taking light strolls at home. I have slight blood pressure. Though it's not so high, so i don't have any bp medications. I am concerned if I exert myself it will increase. I am 34 weeks pregnant. My mother in law says I need to walk for 1 hour everyday or I will have painful labour. Is it true???