assistant: This is a high-stakes narrow-spec query — marathon training with a specific pace target. Before I recommend, one clarifying question will help me dial in the right shoe: **Are you currently in a shoe you like, or are you starting fresh?** If you're already in something that feels good, knowing that shoe (and what you like about it) helps me match the training-build geometry and ride character you know works for your biomechanics. That said, here's what I'm reading from your numbers: you're a heel striker at 4:30 marathon pace (~10:18/mi), running solid weekly mileage, and you've got time to build. For marathon build-up, you want a shoe that rewards long, steady miles — something with enough cushion to protect your heel over 18–20 milers, but snappy enough that it doesn't feel sluggish on tempo and long-run work. Your weight (85 kg / ~187 lbs) means you'll benefit from a shoe with robust stack and energy return rather than a lightweight racer. Here are three picks that span your build-up needs: **Kiprun Kipstorm Tempo v1** — Best value super-trainer for marathon build-up. 43/35mm stack with a rocker and high energy return, built for exactly this: long tempo and marathon-pace workouts. The Run Testers call it a genuine rival to the Megablast at half the price. Runs long, so size down half a size. One caveat: it's firmer and crisper than a pure cushioned trainer, so if you prefer a plush, forgiving ride on easy days, this leans snappy. **Mount to Coast C1 v1** — Purpose-built long-run shoe. 42/36mm stack, moderate rocker, and 500–600 mi durability. True-to-size fit, wide forefoot. This is the workhorse for your 18–20 milers — high energy return without the snap of the Kipstorm, so it's more forgiving on the back half of a long run. **ASICS Megablast v1** — The premium pick. Maximal cushion, excellent expert reception, and versatile enough for both easy days and marathon-pace work. At $225, it's pricier, but reviewers consistently rank it as a top super-trainer for this exact training block. No plate, so it's softer and less snappy than the Kipstorm, but that's an advantage on recovery runs. **Follow-up:** Are you planning to rotate shoes during build-up (e.g., one for long runs, one for tempo), or do you want a single workhorse? That'll help me narrow which of these three should be your primary.

assistant: Got it — you're smart to focus on durability and protection over race-day speed for your build-up. Daily trainers are exactly what you need: they're built for 300–500 miles of steady work, which is what marathon training demands. Here are three picks that'll carry you through 20-milers and tempo runs without breaking down: **Kiprun Kipstorm Tempo v1** — Best value for marathon build-up. 43/35mm stack with a rocker and high energy return. The Run Testers call it a genuine rival to the Megablast at half the price — it's firmer and snappier than a pure cushioned trainer, so it rewards tempo and marathon-pace work. Runs long; size down half a size. At $170, it's the budget win here. **Mount to Coast C1 v1** — Purpose-built long-run shoe. 42/36mm stack, no plate, and 500–600 mi durability. This is the true workhorse for your 18–20 milers — high energy return without the snap of the Kipstorm, so it's more forgiving on the back half when fatigue sets in. Well-regarded, true-to-size fit. **New Balance 880 v15** — The cushion-first pick. 38/32mm stack with an aggressive rocker and high cushioning. It's heavier (281g) and lower energy return than the other two, but that's intentional — it prioritizes protection and shock absorption for long, steady miles. True-to-size, wide forefoot. At $140, it's the cheapest option and a solid all-day trainer if you're rotating shoes. I'm dropping the **ASICS Megablast v1** from my earlier suggestion because at $225 it's premium pricing for a daily trainer when the Kipstorm delivers 90% of the performance at $170 — and for marathon build-up, that durability and value matter more than marginal ride differences. **Follow-up:** Are you planning to rotate between a snappier shoe (Kipstorm) for tempo days and a cushioned one (880 or C1) for easy/long runs, or do you want a single workhorse that handles both?