For those of us who want to go into the weekend focusing on the health of our bodies, there are a couple other versions of the Sworkit App that might be of interest to you.
There are several versions of the Sworkit App you can download for free (premium option without ads) that target a specific muscle group. The options include focused exercises for Abs and Core, Butt and Arms/Chest/Shoulders. There is an advanced Stretching and Pilates version as well.
All these apps are free and complement the main version of Sworkit quite well.