1-11-11 End With A Tabata

I'm onto week three of my Kettleworx program. But I'm throwing in a tabata at the end because I wanted to add some intensity. Here's what I'm doing:
Cardio Kettleworx week 3, about 20 minutes.

Then the tabata:

High Knees 53 (running in place bringing knees up as high as possible)
Pushups 13
High Knees 53
Tricep Dips 14
High Knees 52
Pushups 8
High Knees 54
Tricep Dips 17

Remember it's 8 rounds of 20 seconds of really intense effort with 10 seconds of rest. I want to work on my pushups, but the dvd had some too so the tabata ones were hard.  Even if I can't get all the way down, I'm not going to my knees. My goal is to do 20 pushups on my toes going all the way down without a break. Remember you'll need an interval timer for tabatas. So either get a Gymboss or try out this one. It's already set up for one tabata, but you can change it to whatever you need.