What is Yan Zhenqing's calligraphy style? Or characteristics.

Yan Zhenqing's regular script, contrary to the calligraphy style of the early Tang Dynasty, uses the strokes of seal strokes to harden the fine into plump and vigorous, with broad and magnificent structure, healthy and dignified. His running script is rich and vigorous, and this style also embodies the prosperous style of the Tang Dynasty empire, which is a typical example of the perfect combination of calligraphy beauty and personality beauty.