Here's the video demonstration for Exercise 4 with the metronome set to 41 bpm to represent beat 4 of the bar.
Remember to tap your foot on beats 2 and 4!
Again, I improvise somewhat with the rhythm of the chord sequence but this is not written out as I don't want you to have too much to learn when you should be focusing on the time feel and rhythm. Simply try to emulate and match my feel as best you can.
Good luck