"The Prophet used to try to fast on Mondays and Thursdays."  

كَانَ النَّبِيُّ ﷺ يَتَحَرَّى صَوْمَ الاِثْنَيْنِ وَالْخَمِيسِ قَالَ وَفِي الْبَابِ عَنْ حَفْصَةَ وَأَبِي قَتَادَةَ وَأَبِي هُرَيْرَةَ وَأُسَامَةَ بْنِ زَيْدٍ  

"The Messenger of Allah would fast Saturdays, Sundays, and Mondays in one months, and Tuesdays, Wednesdays and Thursdays in the next month."  

كَانَ رَسُولُ اللَّهِ ﷺ يَصُومُ مِنَ الشَّهْرِ السَّبْتَ وَالأَحَدَ وَالاِثْنَيْنِ وَمِنَ الشَّهْرِ الآخَرِ الثُّلاَثَاءَ وَالأَرْبِعَاءَ وَالْخَمِيسَ  

the Messenger of Allah said: "Deeds are presented on Monday and Thursday, and I love that my deeds be presented while I am fasting."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ تُعْرَضُ الأَعْمَالُ يَوْمَ الاِثْنَيْنِ وَالْخَمِيسِ فَأُحِبُّ أَنْ يُعْرَضَ عَمَلِي وَأَنَا صَائِمٌ