Hmm... interesting. Even though I did just a quick exercise yesterday, my muscles are all sore today. It seems that the short workout was enough to work my body thoroughly. And that is saying something because there was a time when I used to go through 60 to 90 minutes long workout sessions at the gym and hardly feel sore the next day.
Perhaps it's because I didn't do sufficient warmups or stretching but I doubt that that is the case. Maybe it is indeed true that you don't have to endure long workouts - especially when it comes to strength training - but you just need to do effective workouts instead.
What do you think?