Every day for 30 days, we pushed through the infamous “Bring Sally Up” push-up challenge—and then hit repeat. What started as a viral trend became our daily torture session and test of willpower.

Timbaland & Magoo’s classic has inspired social media users to do the “Breathe In, Breathe Out” Push-Up Challenge. Some users are taking things to the extreme. The “Breathe In, Breathe Out” Push-Up ...