Doe de plank-challenge

WEEK 1

  MA - WO : 20 sec.

  DO - ZO : 30 sec.

WEEK 2

  MA - WO : 40 sec.

  DO - ZO : 50 sec.

WEEK 3

  MA - WO : 60 sec.

  DO - ZO : 70 sec.

WEEK 4

  MA - WO : 80 sec.

  DO - ZO : 90 sec.