This time period on my way backmost to Birmingham from a overmuch needful holiday I listened to a discourse by Tim Keller on activity and it was conscionable what I needful. I highly recommend it, especially as we enter into another Monday (no matter what your 'activity' is) and this busy season and it is easy to get burned out. I am not sure if you can find it online but if you download the app and go to 'audio' then 'Genesis' you will find it there.