When the call to Subh prayer was given, the Messenger of Allah ﷺ would pray two brief rak'ahs before going to pray.
عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ كَانَ إِذَا نُودِيَ لِصَلاَةِ الصُّبْحِ رَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ قَبْلَ أَنْ يَقُومَ إِلَى الصَّلاَةِ وَرَوَى سَالِمٌ عَنِ ابْنِ عُمَرَ عَنْ حَفْصَةَ