I think the amount of exercise your doing is more realistic for a woman in todays world.
Gym membership is dramatically expensive but i dont think its needed in all honesty. I think that simple exercises like light cardio (walking, running, jogging, etc) are a good thing. Although, i prefer to just go for a long walk as i don't feel as stupid looking and yes, large chests are a differculty too!

I'd suggest that walking, swimming and even 'at-home' exercises like sit-ups/crunches for half an hour a day or so would be more fitting. Things like sit-ups are more more do-able and you can do them while watching the television.
It is hard in todays busy society to find time to exercise and although it may 'only be an hour', its still time that i, frankly, havent got time to use! When i get in, i want to unwind and relax! What your doing and your timing sounds perfect! Keep up with that!
