How to use the online timer
A minute is a reasonable target for a plank, and it is long enough that form rather than strength decides the outcome. The trunk should be a straight line from heels to shoulders, elbows under the shoulders, ribs pulled down and the backside neither in the air nor sagging towards the floor. Hips dropping is the usual first failure, and once it happens the position has stopped working the muscles it was meant to.
Longer is not better. Holding a plank for five minutes mostly demonstrates tolerance for discomfort, and it is a poor use of training time compared with shorter holds done properly or harder variations. Once a minute is comfortable with good form, lifting one foot, adding weight across the back, or moving to a position with less support does more than adding another thirty seconds.
Breathe throughout, since bracing usually turns into holding the breath, which makes the last twenty seconds far worse than they need to be. The minute will feel considerably longer than a minute, and the last fifteen seconds are where the position quietly deteriorates while the person holding it feels heroic, so it is worth checking the line in a mirror or a phone camera rather than trusting the sensation.
Common questions
Should I be aiming for longer holds?
Not particularly. Beyond a minute or so it mostly tests tolerance for discomfort. Once a minute is comfortable with good form, a harder variation does more than adding thirty seconds.
How do I know my form has gone?
The hips are the giveaway, sagging towards the floor or lifting into a peak. Check the line in a mirror or a phone camera, since the position deteriorates before it feels like it has.
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