Plank time:
12/01~ 45.79 sec's
12/02~ 50.28 sec's
12/03~1:00.23 min's
12/04~1:08.30 min's
12/05~1:09.29 min's
12/ 06~ 40.23 sec's (my arms just could not do this today)
12/07~ 50.00ish sec's (inaccurate time because I didn't reset my stopwatch lol)
12/08~1:01.40 min's
12/09~1:06.61 min's
12/10~1:10.56 min's
12/11~1:12.71 min's
12/12~1:14.89 min's
12/13~1:03.35 min's (just could not hold it any longer )

WOW!!! These puppies are hard to do...no wonder they work so well!
But hard or not I will plug along doing them the best I can because my core is mush now lol