Cardio core interval training on the ball
Do the warm-up provided on Day 1 and then complete each of the proposed exercises, one after the other. Jump rope for one minute between each of the exercises.
If you don’t have a ball at home, you can redo the Day 2 session to tone your abs.
The exercise ball is an excellent training tool because it contributes to developing stability by soliciting the stabilizer muscles, as well as the muscles involved in each exercise.