Oh the joy of exercise

I am tired and exhausted! I keep waiting for this fatigue feeling to pass, but it doesn't. I mean, how long does it take for your body to get use to working out??? My neighbor and her friends have this workout they do every day (M--F) at her house from 4:30-5:30. She asked me to join the group about 2 1/2 weeks ago...so I did...thinking "OK...this will be good for me...how hard can it be?". WOW! It is quite the workout. Now I'll admit, I'm not the best in shape person right now ...no laughing please...(although my goal is to be the buffest one in town some day...again, no laughing please), but this is hard work! However, it does help me in regards to my stress level, and I am getting out of the house every afternoon and having conversations with ADULTS too...which is always nice (as anyone with young children can probably relate). OK OK...enough moaning and complaining for one day. :)