There are a couple variables that make this workout successful.
1. Choosing the correct weights in this workout is key. Too heavy and you'll need too much recovery time. Too light and it will be too easy. Make the necessary adjustments so the weight is approximately a 7 out of 10. Try not to change weights each set. Find the right weight and stay consistent
2. The volume in this workout is high. The first few weeks you may need to do 2 sets rather than 3.
3. If you feel like you've got the right weights, challenge yourself by timing each round. If you're dropping your times, then it's a good chance you need to increase your weights slightly