The back of my calves ached. I got the weights just about right so the upper body stuff worked really well and my posture is better today with the muscles just feeling a little tight rather than aching. We managed to avoid the temptation to stick big weights on and get competitive luckily, its all about technique and repetitions not weight lifting after all. The gym I used to go to with a friend years ago was full of guys taking steroids and bench pressing huge weights. The looked down on us doing lots of reps with light weights. Mind you I bet they all have horrid tempers and more flab than me these days.