Hello, Up above said it right? To build muscles...you will need to tear them down. Never over do it. If you body is soar is because you have not use those muscles before, and they have been stretch out. It is the resting time (few hours -couple of days)..that the muscle will heal.
Read any books on muscle building...it should explain the princples of how muscules are built.
The minute you stop using those muscles....it will start shrinking back down. Like pumping air into a balloon..you stop so does the balloon. Keeping blowing...it grows.
Building muscles is like that...do the jump ropes,push-ups,squats,sit-ups and all the others...we must not stop doing them daily. Off course different body parts on different days! ...the body/muscles need rest to build. Get a good book on muscles building. ......hope this helps..
Look at running...if you stop for a while...you will need to build up to your old number (times) again...Aloha
PS: Now the fun begins....the true meaning of training in the martial arts..