Twin Exercise

Do you think this is too much exercise?

I would like to walk to and from the gym. It is approximately 2.8 miles away from my house. My workout routine is for one hour. I want to go at least three times a week. I don't want to strain my muscles. Yet, I'm more than fifty pounds over weight and need to lose it fast(I had twins).So give me your honest thoughts.

this is not consider too much exercise but be sure to get enough sleep and workout each bodypart everyday. I suggest doing cardio on weekends will also help.