How many of you guys focus on L4 all year round? Do you think that you reach a point when L4 has reached the highest level and theses no benefit? My training plan calls for one L4 w/o or a 40min tt once a week and Ive reached my goal fpt, now it just seems like I'm maintaining it and it becomes a grind.. After 12weeks of this -t/p calls for replacing the L4 w/o's with L5 5x5'S which I can understand, but I'm in fear of loosing my fpt over the next 6wks! Any input?