I’m not sure about the jello/tingling feeling. I know that when I push myself to hard I need a day to recuperate. Congrats on running for a whole .5 mile! I’ve been increasing my jogging time/distance each week, too. When I first started I could even jog for a 1 minute. Now I’m up to 11 minutes (1 mile). I want to be able to do a 10 min mile in the next few weeks. Anyhow, good job…keep up the good work.