Marathon Training Commences; Minor Injury; How to start?

City of Oaks Marathon count down: 16 weeks (from yesterday - Sunday)

Week 1 Training* (in no particular order) Interval Run: 3 x 1600m @ 6:12 w/ 1min rest Tempo Run: 2 miles easy; 2 miles @ 6:45; 2 miles easy Long Run: 13 miles @ 7:56 Cross Train 1: Swim or bike Cross Train 2: Swim or bike

Current health status: Muscle soreness from Saturday morning weights (good pain); Right leg groin sprain healing, but still not sure about running on it (bad pain).

Five workouts. I did a one hour bike ride yesterday morning, so Cross Train 1 is checked off. My challenge now is if I should chance a run on the sprain. I'll probably not do anything today, but will I be good to go tomorrow? Which one of the workouts would be best to start with? The tempo run seems to be a good balance between distance and speed, but I did a similar run last Thursday that seemed to flare it up a bit.

On a motivational note, as I started my bike ride at 7am yesterday I recognized a guy from my running group heading in the opposite direction. He didn't see me so I didn't stop. He is training for his first marathon, also the City of Oaks Marathon. An hour later, I was almost finished riding and I saw him again, still running. This time I stopped and we chatted briefly. I told him I saw him an hour ago and commended and encouraged him for being out there. It is cool to know some other runners working toward the same thing and being able to share the joy (and pain).

*according to FIRST program (Run Less, Run Faster) tailored for BQ for my age group