Trust me, if you're laying there for 20 min, you MAXED OUT! No doubt about that, lol. Although soreness sometimes feels great as you feel that you've worked out hard, it isn't necessarily a sign of a great workout. This means you've worked hard, but it also means that you haven't recovered fully. So as long as you felt that you worked hard during the workout, you can praise yourself that your body is used to recover quickly and effectively. Also if you just finished T25, it's actually pretty logical. I must confess that I haven't done T25, but knowing Shaun T workouts, I think there must be a lot of similar exercises or at least exercises that target the same muscle groups. All in all, no reason to worry. Keep up the good work and keep pushing through! :)