Lactic acid

Yesterday after spending too much time in traffic (in D.C. due to some police activity, on I-66, and on beltway) I had to sneak out for a bike ride. This time it was short (21 miles), but less easy (average pace 20mph). I really enjoyed the lactic acid which tried to slow me down. This morning I ran an easy 3 miler (+ short hill sprints). Keeping it easy.