Another question about working out...maybe too much? (Details inside)

I’m back into the swing of things as my legs have completely healed and my knees are back at 100%, yay!

My schedule is as follows:

Mon/Wed/Fri – 6k run (running intervals to get my stamina up)
Tues/Thurs/Sat – weight training (fully body with 24 step-ups, 50 sit-up with weights, 43 mountain climbers, 24 burpees, 24 kettle bell swings in between each muscle group and it takes about 2 hours to do).

What I am finding is that my runs are killing me unlike they were when I was just running with no weights on the off days. I know I’m expending a great deal of energy with this schedule but I really want to improve my runs.

I wonder if I am over doing the weights a bit with all the stuff I do in between each muscle group and whether if I halve the repetitions I do whether it will improve things. It is something I’m going to try.

Does this schedule seem like overkill? Any suggestions on how I can improve my running and the weight training at the same time?