Plank Challenge

So I hope I'm not the only one who fell off the workout regiment a little and is struggling to find the motivation to get back after it. I loved the squat challenge and I felt like it was a commitment that I kept up with so I decided to start that challenge again but to also do it hand-in-hand with this Plank Challenge shown below for core strength. What are you guys doing to push yourself to get back into the swing of things?! I need suggestions!