What does a hill have to do with it? You can ride recovery on hills. You ride only as fast as you need in order to stay upright (3 miles an hour maybe) and ride as slow as you can the rest of the time. So what if you don't get warmed up riding to work. You will do more damage if you push. At 8-10 miles, I wouldn't expect to be warmed up until I rode up to the office door.
If you want to ride with the club and do intense rides both Saturday and Sun, and push at their pace, you have to ride recovery the rest of the time. Mimi, even very experienced and very strong, fit riders cannot ride 7 days a week at intensity. You are too new to this effort level to push this hard, and I'm only saying it because I'm no spring chicken either, it's going to take longer to get strong and fit. Recovery is even more important for us. We just don't spring back like we used it.
If you don't want your legs to hurt quit abusing them day in and day out.