Beginner options
If you have trouble doing the high-intensity intervals on Endurance Booster and Power Blaster days, lower the RPE (see chart below) in each workout by one point; decrease the length of the work intervals; or, increase the length of the rest intervals.

Advanced option
Add one or two more intervals to your Power Blaster workouts, performing 2-4 minutes at RPE 8-9 and an equal number of minutes at RPE 5-6.

Strength
Do two total-body strength sessions a week on two of the days you do your cardio workouts, as outlined in "Supersculpt Your Body." ADD INLINE LINK TO THIS

THE RATE OF PERCEIVED EXERTION (RPE)

Use the RPE scale to estimate the intensity of your workout session. Here's how the four levels are defined.
RPE 3-4 Easy to moderate; you should be able to maintain this level and carry on a conversation with minimal effort.
RPE 5-6 Moderate; you can maintain this level and have a conversation with some effort.
RPE 7-8 Difficult; maintaining this level and having a conversation requires quite a bit of effort.
RPE 8-9 Peak effort; you won't be able to maintain this level for more than 3-4 minutes; no-talking zone.

CARDIO CALENDAR

June 1: LIFESTYLE
June 2: POWER BLASTER
June 3: LIFESTYLE
June 4: OFF
June 5: BASE BUILDER
June 6: LIFESTYLE
June 7: LIFESTYLE
June 8: ENDURANCE BOOSTER
June 9: LIFESTYLE
June 10: POWER BLASTER
June 11: LIFESTYLE
June 12: OFF
June 13: BASE BUILDER
June 14: LIFESTYLE
June 15: POWER BLASTER
June 16: LIFESTYLE
June 17: BASE BUILDER
June 18: LIFESTYLE
June 19: POWER BLASTER
June 20: LIFESTYLE
June 21: OFF
June 22: ENDURANCE BOOSTER
June 23: LIFESTYLE
June 24: POWER BLASTER
June 25: LIFESTYLE
June 26: OFF
June 27: BASE BUILDER
June 28: LIFESTYLE
June 29: POWER BLASTER
June 30: LIFESTYLE