328 classes in 321 days.
A few months ago I was talking with one of my teachers (Sheri) and told her I was getting tired or wiped out on the floor series. I work pretty hard during the standing series, but then I was losing energy fast as the floor series went along.
She gave me a few pieces of advice on the floor series which I've followed ever since and which generally helps out. I'm not perfect of course, but it's a lot better. Here are the two pieces of advice she gave me:
1) Do the sit ups well. Yes, you have to exert energy to do them, but they end up giving you more energy to go into the next postures. I didn't really believe her at first, but after trying it, it does make a big difference. My sit ups don't look good at all, but I try hard and it pays off when going to the next posture.
2) TAKE YOUR FULL SAVASANAS. I put this in caps for a reason. It gets hammered home by our teachers, but the savasanas really are where the benefits happen and they re-charge you for the next postures. It's very common to see people grab some water after the posture just before savasana, or take a few extra seconds getting in to it. I used to do the same thing, and it just makes things worse. You need every second you can get. And here's the other thing - you're supposed to get 20 seconds for each savasana, but it doesn't always happen. Try counting the seconds sometime - you'll see what I mean.
Since I started following this advice, things have gone much smoother, and I'm often stronger at the end of class than the beginning, which is how it's supposed to be:)