What exercises in 1.4 have stood out for you? Here are some that evoked insight for me (or made me go "doh"): 3, 4, 5, 8, 10, 12, 13. I'll do some more tonight

What exercises in 1.4 have stood out for you? Here are some that evoked insight for me (or made me go "doh"): 3, 4, 5, 8, 10, 12, 13. I'll do some more tonight. (#5 was particularly "doh".)