I'm about 7 months into a renewed strength training program. I work out three times per week, or every other day, as time permits. I can provide details of the workout if necessary, but it's basically 7 primary barbell lifts 3 sets of 10 reps each, full body each workout, and the weights used are based off of squatting with my body weight on the bar. I've done some progressions with the weights, but I'll skip those details for now.
I do not get sore after my workouts. One time I tried century sets at 1/3 weights, and that did leave my legs very sore. So, I can, if I choose to, do a workout that will give me DOMS. But I don't get DOMS from my normal routine.
However, in the morning, the day after, I feel stiffness in the muscles I've worked out. I rate the stiffness as mild. It goes away after I get moving for the day, or after doing a morning stretch routine, which is my normal morning habit.
I'm 52 years old, 5'9" height and 148 pounds weight.
Should I regard this stiffness as normal, or a sign of over training?
I've been thinking of it as a sign that my work outs provide enough intensity, but because I don't feel actual soreness, I'm not overdoing it. I'm just not sure.