{
  "presentation": "complete-card",
  "format_version": 3,
  "overview": "A long run is one of the longest running sessions in a runner’s week. It offers practice staying on your feet longer, often for a distance event. Some stay easy throughout; others contain planned faster sections. Length and effort both matter.",
  "overview_sources": "London Marathon · 2026",
  "overview_source_ids": [
    "fit46-long-run-london-advanced"
  ],
  "sections": [
    {
      "role": "explanation",
      "title": "What the session involves",
      "items": [
        {
          "label": "Long is relative to the week.",
          "text": "Hal Higdon’s Novice 10K puts its longest run on the weekend, starting at 3 miles and reaching 5.5. Its distances illustrate one beginner schedule, not a minimum everyone must reach.",
          "source": "Hal Higdon · undated",
          "source_ids": [
            "fit-rebuild-long-run-higdon-novice-10k"
          ]
        },
        {
          "label": "Faster sections can be planned.",
          "text": "London’s 2026 advanced marathon plan includes a 12-mile long run ending with 4 miles at marathon pace. That example belongs to experienced marathoners, not every long run.",
          "source": "London Marathon · 2026",
          "source_ids": [
            "fit46-long-run-london-advanced"
          ]
        },
        {
          "label": "Easy versions allow conversation and walking.",
          "text": "Higdon’s novice schedule keeps running conversational, permits walk breaks, and places rest around the weekend. Longer duration still creates fatigue even at a comfortable pace.",
          "source": "Hal Higdon · undated",
          "source_ids": [
            "fit-rebuild-long-run-higdon-novice-10k"
          ]
        },
        {
          "label": "Shoes, a route and a time window are the basics.",
          "text": "The NHS lists comfortable running clothes, running shoes, a timer and water, especially for longer or warmer outings. A watch is useful for timing; specialist tracking is optional.",
          "source": "NHS · undated",
          "source_ids": [
            "fit-rebuild-long-run-nhs-couch-plan"
          ]
        },
        {
          "label": "Fuel amounts depend on duration and tolerance.",
          "text": "AIS guidance lists 30–60 grams of carbohydrate per hour for endurance exercise lasting 1–2.5 hours, from drinks, ordinary food or sports products. This is sports-nutrition context, not an automatic gel schedule for a beginner outing; gut comfort and hydration also matter.",
          "source": "Australian Institute of Sport · undated",
          "source_ids": [
            "fit46-long-run-ais-fuel"
          ]
        },
        {
          "label": "Distance can hide a very different time commitment.",
          "text": "At an illustrative steady pace of 6 minutes per kilometre, 10 km takes one hour; at 9 minutes per kilometre, it takes 90 minutes. Stops add time to either outing. The same distance therefore leaves different demands on the calendar and route planning. These paces illustrate duration, not a speed target or a rule for fueling.",
          "source": "Illustrative calculation",
          "provenance": "editorial-illustration-20261020"
        }
      ]
    },
    {
      "role": "benefits",
      "title": "Why runners make room for it",
      "items": [
        {
          "label": "It rehearses sustained effort.",
          "text": "Coach Greg McMillan uses long runs to develop endurance and familiarity with fatigue. That is a training purpose, not proof that one weekly outing guarantees fitness or a race result.",
          "source": "McMillan Running · 2005",
          "source_ids": [
            "fit46-long-run-mcmillan"
          ]
        },
        {
          "label": "Race preparation includes practical experiments.",
          "text": "McMillan’s race rehearsals include clothing, shoes, food and drink. Discovering chafing, inconvenient pockets or an unappealing gel in training can be more useful than chasing a faster split.",
          "source": "McMillan Running · 2005",
          "source_ids": [
            "fit46-long-run-mcmillan"
          ]
        }
      ]
    },
    {
      "role": "cautions",
      "title": "Good to know before adding more",
      "items": [
        {
          "label": "A big jump in one outing can matter.",
          "text": "A 2025 study of 5,205 runners linked runs more than 10% longer than their longest in the preceding 30 days with higher overuse-injury rates. It was observational, mostly male, and did not establish a guaranteed safe increase or validate a universal weekly percentage rule.",
          "source": "British Journal of Sports Medicine · 2025",
          "source_ids": [
            "fit46-long-run-session-spikes"
          ]
        },
        {
          "label": "Pain and fainting are not endurance targets.",
          "text": "The NHS says to stop when something feels wrong. Sharp pain, fainting or disordered-eating concerns need a clinician; a longer run is not a reason to override symptoms.",
          "source": "NHS · undated",
          "source_ids": [
            "fit-rebuild-long-run-nhs-couch-plan"
          ]
        }
      ]
    },
    {
      "role": "community",
      "title": "What long runs are like in practice",
      "items": [
        {
          "label": "Forty minutes can already feel long.",
          "text": "Beginner accounts describe 40–70 minutes and, after Couch to 5K, gradually lengthening one day. Some mention additions of 5–15 minutes, not a universal progression. Marathon talk often means 16–20 miles; paired long days belong to ultra discussions. These are different workloads, not a ladder everyone must climb.",
          "source": "Community",
          "provenance": "preserved-community-record"
        },
        {
          "label": "Walk breaks can be deliberate.",
          "text": "Some reports use 9 minutes running and 1 walking; others walk hills or in heat. Runners also describe stiff opening miles, an enjoyable middle and a hungry final 15 minutes. Recording time on feet means recording duration rather than judging every mile’s pace.",
          "source": "Community",
          "provenance": "preserved-community-record"
        },
        {
          "label": "The 20–30% rule gets argued over.",
          "text": "In r/AdvancedRunning, some use that share of weekly mileage, while others say race distance, training days and recent volume change its usefulness. One runner even reported a 50-mile week with no distinctly long outing. A percentage does not settle the session’s purpose.",
          "source": "Community · Reddit · r/AdvancedRunning",
          "source_ids": [
            "fit46-long-run-reddit-share"
          ]
        },
        {
          "label": "A coach’s percentage is not a finding for everyone.",
          "text": "A TrainerRoad poster recalled BarryP’s running advice: under half the week, ideally 30–35%, to protect consistency. Other replies questioned whether the cycling podcast’s 50% observation applied across volumes or reflected race recovery. The running advice was secondhand; the analysis was correlational.",
          "source": "Community · TrainerRoad · 2026",
          "source_ids": [
            "fit-rebuild-long-run-trainerroad-half-share"
          ]
        },
        {
          "label": "Easy can feel awkwardly slow.",
          "text": "A new runner reported 180 bpm at 6:30/km. TrainerRoad replies offered a mile running plus a minute walking, a slower shuffle, or checking watch fit. They disagreed about the cause; forum replies cannot diagnose a heart-rate reading.",
          "source": "Community · TrainerRoad · 2024",
          "source_ids": [
            "fit-rebuild-long-run-trainerroad-beginner-hr"
          ]
        },
        {
          "label": "Food has to be affordable, tolerable and carryable.",
          "text": "In r/XXRunning, runners debated fueling beyond 60 versus 90 minutes, gel expense and textures. Options included candy and stroopwaffel pieces. One runner’s two 10-ounce bottles needed a fountain refill on an outing over three hours. Carrying supplies and knowing refill access were practical obstacles, not just nutrition numbers.",
          "source": "Community · Reddit · r/XXRunning",
          "source_ids": [
            "fit46-long-run-reddit-fuel"
          ]
        },
        {
          "label": "Eating more does not fix every lost afternoon.",
          "text": "A runner worried about doing Halloween activities after 12 miles despite fueling during the run. Replies described better afternoons after meals or slowing down, but others remained exhausted despite improving food, hydration and sleep. One reported that even 70-mile weeks did not make 12 miles effortless.",
          "source": "Community · Reddit · r/Marathon_Training",
          "source_ids": [
            "fit46-long-run-reddit-fatigue"
          ]
        },
        {
          "label": "A sustainable weekend matters more than a heroic outing.",
          "text": "Reports mention setting aside a morning, meeting friends, choosing a loop with an early exit and leaving the next day easy or free of training. Groups help attendance but can pull the pace upward; treadmill runners watch shows to ease boredom. When other commitments intervene, some choose a shorter outing they can fit into the day. Over a training block, an outing that once felt long can become familiar.",
          "source": "Community",
          "provenance": "preserved-community-record"
        },
        {
          "label": "Bonking describes an energy crash.",
          "text": "Runners use the word for a pronounced loss of energy during a long effort. Reports mention gels or ordinary snacks after roughly 60–75 minutes, with no shared dose. Warnings about chest pain or a sudden calf pop describe different concerns from tiredness. An energy crash is not a toughness requirement or a diagnosis.",
          "source": "Community",
          "provenance": "preserved-community-record"
        }
      ]
    }
  ],
  "related": [
    "easy-miles",
    "couch-to-5k",
    "tempo-run",
    "hyrox-race",
    "rest-days"
  ]
}
