Share a video from YouTube, mark the line you want with Set A and Set B, and it loops straight away. Slow it to 0.5×, trim the edges on a timeline zoomed to the phrase, and save it as a clip you can drill again tomorrow.
Hit share in the YouTube app and pick LoopLingo. The video lands in your library and opens, ready to play.
Set A where it starts, Set B where it ends. Drag either handle to trim, or drag the middle to slide the whole region.
Loop at your own speed, save the good ones as clips, and play them back in sequence whenever you practise.