Ok so here's my workout for yesterday..let me start by saying i am used to 3-4 mins rest between sets and about 5 mins between exercises, i've been doin this for 5 years now if i make a change its always with the amount of reps never mess with rest periods, well yesterday i changed it up and kept my rest periods at 30 seconds with 2 minutes between excersises..NUTS! to say the least . I dont really get sore anymore, and if i am it usually hits after 2 days and is gone the following..well i was sore last night! 8 hours after working out and today it feels like someone took a baseball bat and slammed each pec with it and then the same to my tri's