Lydia, you do all 50 of one exercise before moving on to the next. You can break it up or rest as needed for each exercise, but with so many to do, the idea is to just get it over with, so if you can do 25 of something, like push press, do that, rest 10 or 20 seconds, and try to finish the set. Some things, you may only be able to do 3 at a time, or 10 at a time, so you do that. If you can only do 1 at a time, say the burpees at the end, then a good strategy is just to try and keep a steady pace going, even if it's a slow pace, and don't stop unless you're cramping up or something and have to walk it out. The idea is to keep going, to do the exercises in order, and just get the best time you can. If you break it up and go 10 box jumps, 10 jumping pull-ups, etc, 5 rounds, it's not the same workout, wouldn't be CF "legal", but would still kick your butt, I'm sure. Make sure you have a water bottle or two ready beforehand, and if your hands aren't used to high rep pull-ups or hanging from the bar for KTEs, you may want to wear gloves or do the gymnast style taping beforehand to protect them. Mine are pretty good, and they still were getting pretty beat up by the KTEs today.
Here's the CF report for today's Filthy Fifty at my gym, with the prescribed weights we used. Note that we had to sub good mornings for the usually prescribed back extensions, since our gym only has one GHD at this time.
Filthy Fifty
50 Box/Tire Jumps (I think 20" is prescribed, or 24"? we have 24" tractor tires)
50 Jumping Pull-ups (yes, jumping is prescribed..higher box to stand on=easier)
50 KB Swings (36#men/25#women)
50 Walking Lunges (trailing knee touches the floor each rep)
50 Knees to Elbows (hanging from pull-up bar)
50 Push Press (45# men/30# women)
50 Good Mornings (45# men/30# women)
50 Wall Ball (20#m/14#w)
50 Burpees (chest to floor, full hip extension and jump at top)
50 Double Unders (or 250 single jumps with jumprope)
*PS to Lydia or anybody else doing this on their own, these are the prescribed weights, so scale as needed for yourself...for example you might use a lighter medball for wall ball, just do knee raises instead of knees to elbows, or do the KTEs lying on the floor with bent arms (this is actually a good one, IMO), use DBs for push press and/or a DB for swings, and do knee push-ups for the burpees if needed...if you're not used to high reps like this, then you want to scale back the weights from what you can normally do, or you can even scale the reps down if needed. Don't hurt yourself, is all I'm saying!
I did an 800 meter slow run and some shoulder flexibility work and stretches, that was it for my warm-up. We nixed the runs since this is already a long workout. My time was 47:50. I'd hoped to do better, but the KTEs and Wall Ball slowed me way down, as I could do only 2 or 3 KTEs before dropping off the bar, and wallball was like, "1", "1", "1", lol.
We had to run 3 groups through the WOD today, so the gym wasn't clear until noon. I forgot my lunch today, so walked to the corner store for a chocolate milk and called that my PWO meal. Once everybody was out, my partner and I did our part of the gym cleaning, which wasn't too bad, but everything we had to move off the floor for cleaning felt about ten times heavier than normal.
You are going to 
incorporating yoga positions into your workouts. (quiet Mel 
) It's just a beautiful way to bring down or increase your heart rate depending upon your needs as well as challenging you body in strength and flexibility in other ways. Ask her to teach you the pigeon pose. It's a GREAT hip opener.
(still hoping to be able to do this but it ain't happening no matter how many candles I light.) 
lydia! Glad you are better. And even I have been doing some yoga. We incorporate a few minutes of it at the end of most CF sessions.
CrossFit is adding yoga to their cooldown. I like this...I really need to head over there. The cold kind of set me back. Also need to find care for DS while I visit the place. That involves a telephone and a calendar. I hate both of those things. 
ETA: looking at my time for that workout from Alena's bday (42 mins plus), I'm pretty sure the boss lady is going to nix the idea of the mile run(s), since that would tack 20 mins onto most everybody's time.
This might be a good time to start riding my bike to the gym. 
