I was reading up on some 5k indicator workouts and saw a lot of stuff about doing 4x1 mile at goal race pace with 1.5-3 min. rest in between. I also saw a workout with 5 sets of 1k at race pace, 200 jog, and 400 at 2 mile race pace. 3 minutes rest in between sets. I feel like the second workout is much easier than the first. Anyone have any experience with these or similar workouts and how much it predicted their future 5k time?