I'm running my first marathon on March 1. My plan (4 Months to a 4-Hour Marathon) doesn't mention what to do about weight training and ab work during that time.

Three times per week, I do three sets of fifteen reps of each exercise, except for the wall sits and bench step-ups. (I do three sets of wall sits and three sets of ten reps of bench step-ups.) This is my current weight-training routine:

chest: 55 pounds on the chest press machine or flat-bench presses with 25-pound dumbbells

shoulders: overhead presses with 12.5-pound dumbbellss

back: 55 pounds on the lat pulldown machine

triceps: 50 pounds on the pulley machine for flat or V-bar pressdowns

biceps: curls with a 25-pound straight barbell

legs: 120 pounds on the leg press machine

       40 pounds on the leg extension machine

       80 pounds on the hip adduction machine

       45-50 seconds for a wall sit

       deadlifts with 30-pound dumbbells or a 70-pound barbell

       65 pounds on the seated leg curl machine

       60 pounds on the hip abduction machine

       bench step-ups with 20-pound dumbbells

calves: toe presses with seated leg press machine set to 120 pounds

shins: heel presses with the seated leg press machine set to 120 pounds

Would it be wise to continue to do this while tapering?

I cut out weight training about 4 weeks out from my first marathon.  As a matter of fact, I barely did anything except run, eat and sleep!

I don't know if it hurt anything or not, but I was dialed in on the big prize those last weeks, and I suppose a little paranoid. 

During marathon taper, I'll also do weight training taper. I still do it, but with lighter weights. And no real weight training leg work the last week before the marathon.