Strength training is all about challenging your muscles and making it as hard as possible.
Belting out dozens of reps, or holding a pose for a long time is actually less effective than something that is so hard you can only do a handful of reps, or hold for a very short time.
If you can hold a plank for just 10 seconds before you are fatigued, that is actually very effective in strengthening your core.
10 seconds sounds like a very successful and effective core workout, rather than sounding like failure.
Strength training is MEANT to be hard and challenging.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0