腹肌训练日 Abs day, do follow along！
1) plank in & out - 40 seconds
2) Bicycle Crunches - 40 seconds
3) Boat hold flutter kick - 40 seconds
4) Chair Sit Ups - 40 Seconds
5) Hips up leg raises - 40 seconds
6) Reverse crunches - 40 seconds
7) Floor side crunches left - 40 seconds
8) Floor side cruches left - 40 seconds
9) Twisted mountain climbers - 40 seconds
10) Plank Knees to Elbows - 40 seconds
11) Russian Twist - 40 seconds
12) Side Plank Crunches Left - 40 seconds
13) Side plank crunches Right - 40 seconds
14) Plank rotation - 40 seconds
15) Floor wiper - 40 seconds
16) V-Up - 40 seconds
