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Training plan

Alex Rivera

5k · High school

Every session cited to training science

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Where you are now

5k 18:30

VDOT 48.5

12 wks

Realistic 12-week target

5k 17:22

VDOT 51.5 · +3

A conservative, safe-rate projection — not a promise. It assumes about 1 VDOT of gain per four-week block, the pace a motivated developing athlete can hold in a focused build. Reach it and re-submit your new mark for the next block.

Starting mark

5000m in 18:30

Fitness

VDOT 48.5

your running-fitness score (Daniels)

Peak week

44.3 mi

opens at 31.5 mi

Block

12 wks

Your five gears

Every run in the plan is set at one of these paces. Anchored to your VDOT off the Daniels table, not a formula.

EEasy

7:34–8:56/mi

Most of every week, fully conversational

MMarathon

7:46–7:56/mi

Goal-race endurance work

TThreshold

6:32–6:46/mi

Comfortably hard, lifts your ceiling

IInterval (VO2max)

5:42–5:52/mi

Top-end VO2max power

RRepetition (Speed/Economy)

5:05–5:15/mi

Short, sharp reps for speed and economy

Your season

Mileage ramps ~5%/week with a recovery week every fourth, then tapers into your goal (the ≤10%/week ramp and 20–40% taper the plan is built on).

31.5
1
33.1
2
34.7
3
31 ↓
4
36.5
5
38.3
6
40.2
7
35.9 ↓
8
42.2
9
44.3
10
33.5
11
33.5
12
BaseBuildTaper↓ Recovery week — volume eases to absorb the load
  1. BASE (General Prep)Weeks 1–6

    High easy aerobic volume (80–85%). Strides 2×/wk. Optional light tempo every 2 wks.

  2. BUILD (Specific Prep)Weeks 7–9

    Introduce threshold work 1–2×/wk. Add short I-pace reps. Volume holds or rises modestly.

  3. SHARPEN (Pre-Competition)Weeks 10–10

    Race-specific quality (T + I combos). Volume drops 10–15%. Neuromuscular activation.

  4. TAPER + RACE WEEKWeeks 11–12

    Cut volume 20–40%. Maintain intensity with shorter efforts. Arrive fresh.

A week in the block

31.5 miles

  1. Monday
    E+R

    Easy run + strides

    5.9 mi @ E pace (7:34–8:56/mi), then 6 × 20–25 sec strides @ R pace (5:05–5:15/mi) — 90 sec walk rest.

  2. Tuesday
    E

    Recovery run

    4.4 mi @ E pace (7:34–8:56/mi). The week's shortest — keep it truly easy to absorb the harder days.

  3. Wednesday
    E

    Medium-long run

    7.4 mi @ E pace (7:34–8:56/mi). Longer than your other easy days — still fully aerobic and conversational.

  4. Thursday
    E

    Easy run

    5.9 mi @ E pace (7:34–8:56/mi). Fully conversational.

  5. Friday
    Full rest. Prepare for Saturday long run.
  6. SaturdayKey
    E

    Long aerobic run

    7.9 mi @ E pace (7:34–8:56/mi). Strictly aerobic and conversational throughout. Do not pick up the pace at the end.

  7. Sunday
    Full rest or light cross-training (walk, swim). No running.

The thinking behind your plan

The sport-science principles that shape this phase — retrieved for your event, level, and where you are in the season. Every one is cited below.

  • Aerobic development

    The single most important driver of endurance improvement is consistent high-volume low-intensity training that builds the aerobic base.

  • Aerobic development

    An effective base period develops not only aerobic capacity but also neurological efficiency, biomechanical patterns, and structural integrity—these non-aerobic components of base training are necessary prerequisites for tolerating specific race-pace work.

  • Periodization

    Effective periodization develops aerobic volume and base qualities before introducing more specific intensity, following the historical arc from Lydiard's long steady phase through structured intervals to race-specific work.

The science your plan is built on11 principles
  • The single most important driver of endurance improvement is consistent high-volume low-intensity training that builds the aerobic base.
  • Elite endurance athletes consistently perform approximately 80% of training at low intensity (zone 1) and 20% at moderate-to-high intensity, with minimal time in the 'gray zone' between thresholds.
  • Easy training days must remain genuinely easy—below LT1, below 70% HRmax, below 1.0 mmol/L lactate—to allow the muscular recovery necessary for quality sessions to be of sufficient quality.
  • The most common error in distance runner training is running easy miles too fast—fast enough to prevent slow-twitch fiber mitochondrial adaptation, yet slow enough to avoid driving high-intensity aerobic gains.
  • Mitochondrial adaptation in each muscle fiber type is intensity-dependent: slow-twitch fibers adapt optimally at 50–70% VO2max, fast-twitch red (intermediate) fibers at ~85% VO2max, and fast-twitch white fibers only above 80% VO2max.
  • Training chronically at moderate intensity ('the gray zone' between LT1 and LT2) produces suboptimal adaptation and accumulates fatigue without providing either the aerobic volume benefit of easy running or the VO2max stimulus of high-intensity intervals.
  • An effective base period develops not only aerobic capacity but also neurological efficiency, biomechanical patterns, and structural integrity—these non-aerobic components of base training are necessary prerequisites for tolerating specific race-pace work.
  • Running economy—how far and fast a runner travels per unit of oxygen consumed—varies by up to 30% between runners of similar VO2max, making it a critical independent determinant of performance.
  • Training capacity follows a build-maintain-connect logic: building a new capacity requires frequent weekly stimulus; maintaining it once built requires only 40–60% of the original volume/frequency; connecting built capacities requires race-specific integration work.
  • A single 2-hour easy run produces greater aerobic adaptation than two 60-minute runs at the same intensity, because mitochondrial stimulus in slow-twitch fibers scales with continuous duration.
  • Aerobic energy production yields approximately 18x more energy per glucose molecule than anaerobic glycolysis, making aerobic efficiency the critical fuel economy factor for events longer than 10K.