very light strength workout

Today I was very sore from running the last two days and decided it would be best to just lift some weights and focus on my core and upper body strength. After some research, I found that for runners, (especially distance runners) low weight and high repetition is most beneficial. I dont want to bulk up or gain mass, just truly have strength. So today, I cut back on everything I usually do in the weightroom by atleast 30 pounds on each machine. For example, I went from a 70 pound bicep curl, to a 30 pound curl. i also raised my reps from 10 to 20 and did 3 sets. I plan on incorporating this into my normal schedule, because I think it's very important to help me be a stronger runner. It's kind of funny how all of the "meatheads" look at me funny and act dominant because they're lifting more weight than me. It just makes them look stupid. That's my small rant. anyways, tomorrow I plan on having a rest day. I'm going to just stay off my feet and let things catch up for a run on friday.