Does anyone know about any credible plank fitness standards? ADVERTISEMENT 744 viewsAugust 5, 2014 0 Jim0 August 5, 2014 0 Comments I would like a plank test to replace a 1-minute sit-up test. Looking for a credible source. 5 Answers ActiveVotedNewestOldest 0 Harris12 Posted 0 Comments Hi Jim, You can just test your clients on the plank and then retest them after few weeks to see if they were able to hold it longer than the first time. Based on their time you can train them accordingly. At least this is what I do (I like it simple). Best, Harris You are viewing 1 out of 5 answers, click here to view all answers. Register or Login