Running on different surfaces

I've been taking this week a bit easier on mileage after feeling some tightness and lingering twinges on my right ITB following Sunday's run. I feel that the right leg is only about 80-85% healthy since the injury. On Monday I gave the legs a break from running. Since then I've kept my runs at about 50-60 minutes while running on different surfaces. Ran on the treadmill on Tuesday, beach on Wednesday, track on Thursday and mostly on grass today. Tuesday and today's run was lovely as I took in the beautiful scenery of Guam's water.

View of Tumon Bay from Two Lover's Point

Yesterday's run on the track was fun. Instead of just circling the track at an easy pace, I decided to add a little speed with some circuit training. After 20' of easy running I did 400s at 5k pace with some core exercises (pushups, situps, crunches, leg-raises, etc.) and plyometric drills between each 400. Did only 7 x 400s as I didn't want to aggravate the ITB. Splits (80, 80, 79, 78, 77, 78, & 80) were fairly consistent at about 5:20 pace