30/30/30 is not a training regimen. It is a list of testing parameters. I have found these parameters to be very beneficial when it comes to improving athletic performance over time. To be certain, strength can be effectively developed in the weight room by athletes who begin there on day one year one. However, this may not the most efficient method of developing that biomotor ability. In short, waiting until the athlete is ready and more able to benefit from an activity will produce a greater result in a shorter amount of time.
With regard to endurance athletes: I find that it is very difficult to include strength training more than twice per week in their schedules. Because of this I recommend bodyweight work exclusively during the first 3/4 years training - 8 to 12 exercises, 3 to 5 sets, 8 to 12 repetitions.
Sample strength program for >1500m athletes
Monday
4x10 - Prisoner Squats, L-Overs, Pushups, Lunge Walk, V-Sits, Decline Pushups, Single Leg Squats, Crunches, Rocky's
Thursday
3x10 - Back Hypers, Reverse Pushups, V-Sits, Lunge Walk, Alternate Arm/Leg Hypers, Decline Pushups, L-Overs, Prisoner Squats, Superman Hypers, Pushups, Crunches, Backward Lunge Walk
Hope that clarifies my earlier comments.