1 circuit... 5 exercises... 5 rounds
Perform 1 set of all 5 exercises with <30seconds rest in between. After you run through the circuit once, then you can rest for 60 seconds before you start round 2(same between round 2 and 3, 3 and 4, etc...)
Reverse lunge--- 12 reps each side (alternating legs) add weight appropriately
Push-ups--- 15 reps (if you can't do a full push-up modify it, if it's easy do clapping push-ups)
Physio ball leg curl--- 12 reps (if it's easy with both legs, try it with 1 leg)
Pull-up OR Inverted row--- 15 reps
Plank--- 60 seconds
If you keep your timing strict, this workout will take less than 30 minutes. It will hit every major muscle group in your body, and you will gain a cardiovascualar benefit from it that will keep your metabolism on overdrive for 12-36 hours after you finish!!!
Unfortunately, I can't coach form or show you the exercises through the computer... so until video clips are up feel free to contact me for more tips.