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Sub-23 sits at the boundary between recreational and structured competitive running. Runners here have a genuine aerobic base and can sustain effort for 22+ minutes at high intensity. The training paces show what consistent training at this level looks like.
Quick answer: To break Sub-23:00 in the 5K (RPI 42.3), your training paces are: easy 9:25/mi, threshold 7:50/mi, interval 7:13/mi. Equivalent fitness: Marathon 3:39:15, Half Marathon 1:45:43.
RPI 42.3 · Goal: 22:59 · All paces in min/mile
Calculated from StrideIQ's RPI equations. Easy pace means "this pace or slower."
These are the predicted equivalent times at other distances for a runner with RPI 42.3 — assuming comparable training for each distance.
Marathon
3:39:15
8:22/mi
Half Marathon
1:45:43
8:04/mi
10K
47:41
7:40/mi
For sub-23 5K, the combination of easy base volume and structured quality sessions produces steady improvement. One interval session per week (400m–800m repeats at interval pace) and one threshold session (15–25 minutes at threshold pace), backed by 25–40 miles of easy weekly volume, is the effective framework. Running easy days genuinely easy is often the most impactful change runners at this level can make — it allows threshold and interval sessions to be truly productive.
For sub-23:00 (22:59): Easy 9:25/mi, Threshold 7:50/mi, Interval 7:13/mi. RPI 42.3. Easy runs at 9:25/mi are where 80% of training volume lives. Threshold at 7:50/mi should feel comfortably hard — sustainable for 20 minutes.
Most runners who run 3–4 times per week for 6–12 months with some structured quality work can reach sub-23. The key is adding interval or threshold work to the existing easy-run base. Runners who have never done structured quality sessions often improve dramatically (1–2 minutes off their 5K time) within a few months of adding one interval session per week.
Sub-23 5K fitness (RPI 42.3) projects to approximately 47:41 for the 10K. This assumes comparable 10K-specific training. Your aerobic base supports the 10K distance well — the main adjustment is adding slightly more threshold work, which targets the sustained lactate-threshold effort the 10K demands.
Paces calculated using StrideIQ's RPI equations. All values derived from the same formula used by the StrideIQ training pace calculator. Goal times use the target-minus-one-second convention (e.g., sub-20 = 19:59 input).