Focus on stretching and becoming more flexible in your hip flexors.
As you begin the process of training for your half marathon, the first 4 weeks will focus on base training with a lower perceived effort and technique. Focus on body adaptation.
As you get further into your training, you will find that your body will be able to better adapt to running consistently without taking breaks.
Take notes on how you feel after you finish and make sure to get in a good stretch. Write down your HR, time and post run thoughts in here.
3x15 Side Crunches (both sides)
3x15 Opposite Arm and Leg Raise
3x30 second Plank
Complete a full set (each exercise) ending with planks.
3x10 Regular Pushups
3x5 Tricep Pushups
If you feel that you can get in a 2 mile run, I absolutely encourage you to do so. However, for many people who just start training, the first run can be exhausting and create soreness the next day. If that is the case, 30 minutes of cross training can do the body good. Complete 10-12 reps, 3 sets each. Focus on a mixture of arms, abs and legs.
Go for an easy run today and follow it up with some cross training.
3x10 Speed Skaters
3x10 Hip Thrusts
3x10 Kickbacks (left and right
3x10 Single Leg Deadlift