Limping Marathon Runner

Once in a while, you've got to throw in a reasonable amount of shock to your body. Why would any perfectly sane person would do that? Mmm ... humans are highly adaptable to gradual changes. Hence, sudden different tempo would make your body guess. After my 3.6km run half and hour ago, I did some chin ups. Instead of performing the reps in a descending numerical order, I did it in an ascending order. 1, 2, 3, 4, 5, 6, 7, 8, 9, 7. Mm m.. 7.... shouldn't it be 10? Fact is,.. I knew I could not do 3 more proper chin ups. Eventually, I stayed there.. hanging onto the bar for another 15-20 secs. My forearms are blaahhhhddeeee stiff now. Sounds like the Lamb.