Тренируем планку!

Day 1 - 20 seconds
Day 2 - 20 seconds
Day 3 - 30 seconds
Day 4 - 30 seconds
Day 5 - 40 seconds
Day 6 - REST
Day 7 - 45 seconds
Day 8 - 45 seconds
Day 9 - 60 seconds
Day 10 - 60 seconds
Day 11 - 60 seconds
Day 12 - 90 seconds
Day 13 - REST
Day 14 - 90 seconds
Day 15 - 90 seconds
Day 16 - 120 seconds
Day 17 - 120 seconds
Day 18 - 150 seconds
Day 19 - REST
Day 20 - 150 seconds
Day 21 - 150 seconds
Day 22 - 180 seconds
Day 23 - 180 seconds
Day 24 - 210 seconds
Day 25 - 210 seconds
Day 26 - REST
Day 27 - 240 seconds
Day 28 - 240 seconds
Day 29 - 270 seconds
Day 30 - PLANK FOR AS LONG AS POSSIBLE!!

По мотивам http://www.youtube.com/watch?v=Hwo1qGnyIUI