The moment

So, preciously, his body and power core had been creating a balance and developing together.

But after getting the system notification, he realized the balance had suddenly broken off, his Sub-Technique would make the system issue series of warnings.

Luckily, the system was there and he was still well-fed and as well developing fast, so despite not doing any physical body training his physique was constantly improving and transforming thanks to the system, which meant the bottleneck had more or less of a counter down that would be worn off soon.

While he couldn't practice his Sub-Technique weirdly he could still practice his meditation technique, he found out that the meditation technique was slowly modifying his body. In a way, his Mana would just flow in and out of his body like natural air oxygen, which would energize him like a good night's sleep.