Battle of the Post-Thanksgiving Abs: Kelly Rowland vs Justin Bieber

This should give some of us motivation!

Just days after OD’ing on Thanksgiving food, both Kelly Rowland (31) and Justin Bieber (18) are showing off their wash-board ab game. Kelly, who regularly works out with celebrity fitness trainer, Jeanette Jenkins tweeted:

#Holidayworkouts! I’m blessed to workout with my motivator, @JeanetteJenkins, you can too! #blackfridayspec

While Bieb’s showed off his abs, writing:

‘Back in the gym’

Guess I need to take my a** somebody’s gym too! Sheesh.