Overview
A complete core program isn't just planks and crunches. The core has three jobs: resist extension (front stability), resist rotation (side stability), and transfer force between upper and lower body. This program trains all three.
Each session is a circuit of 6–8 exercises. Complete the circuit, rest, repeat. Weeks 1–4 use 2 rounds. Weeks 5–8 use 3 rounds. Sessions take 20–30 minutes.
Who it's for: Runners, general fitness, military and first responder PT test preparation, or anyone who wants a stronger, more stable core.
What you'll need: Floor space. That's it.
Warm-up (before every session)
3–5 minutes before each session:
- 1–2 minutes of light cardio — jogging in place, jumping jacks, or high knees
- 10 cat/cow stretches (alternate between arching and rounding your back)
- 10 gentle torso rotations each direction (arms relaxed, rotate from the waist)
Choose your starting level
This is a circuit program — no baseline test needed. Instead, pick the level that matches where you are right now:
| Level | Plank hold | What changes |
|---|---|---|
| Beginner | Under 30 seconds | Fewer reps, easier variations (noted in each week) |
| Standard | 30+ seconds | Full reps and standard variations as written |
The program
Each session is a circuit. Do every exercise in order, then rest and repeat. Move with control — these are stability exercises, not cardio.
Beginner modifications are shown in parentheses where applicable.
Weeks 1–2 — Foundation
2 rounds. Learn the movements. Focus on form and controlled breathing.
| Exercise | Reps / Duration | Beginner |
|---|---|---|
| Dead bugs | 8 each side | 5 each side |
| Forearm plank | 20s hold | Knee plank, 15s |
| Glute bridges | 12 reps | 8 reps |
| Bird dogs | 8 each side | 5 each side |
| Side plank | 15s each side | Knee side plank, 10s |
| Bicycle crunches | 10 each side | 6 each side |
Rest 90 seconds between rounds.
Weeks 3–4 — Build
2 rounds. Reps increase and two new exercises are added. You should feel challenged by the second round.
| Exercise | Reps / Duration |
|---|---|
| Dead bugs | 10 each side |
| Forearm plank | 30s hold |
| Single-leg glute bridges | 8 each side |
| Bird dogs | 10 each side |
| Side plank | 20s each side |
| Mountain climbers | 10 each side |
| Lying leg raises | 8 reps |
Rest 90 seconds between rounds.
Mid-program check (end of Week 4): If completing 2 rounds feels easy and you could do more, you're ready for 3 rounds in Weeks 5–8. If it's still challenging, repeat Weeks 3–4 before moving on.
Weeks 5–6 — Push
3 rounds. An eighth exercise is added. Rest periods shorten — you're building endurance now.
| Exercise | Reps / Duration |
|---|---|
| Dead bugs | 12 each side |
| Forearm plank | 40s hold |
| Single-leg glute bridges | 10 each side |
| Bird dogs with pause | 10 each side (2s hold at top) |
| Side plank with hip dip | 8 each side |
| Mountain climbers | 12 each side |
| Lying leg raises | 10 reps |
| Flutter kicks | 15 each side |
Rest 60 seconds between rounds.
Weeks 7–8 — Peak
3 rounds. Highest volume. Holds are longer, reps are higher. This is where the most adaptation happens.
| Exercise | Reps / Duration |
|---|---|
| Dead bugs | 15 each side |
| Forearm plank | 50s hold |
| Single-leg glute bridges | 12 each side |
| Bird dogs with pause | 12 each side (3s hold) |
| Side plank | 30s each side |
| Mountain climbers | 15 each side |
| Lying leg raises | 12 reps |
| Flutter kicks | 20 each side |
Rest 60 seconds between rounds.
Exercise form guide
Dead bug
- Lie on your back, arms extended straight to the ceiling, knees bent at 90 degrees
- Extend your opposite arm and leg simultaneously — reach arm overhead while straightening the leg toward the floor
- Return to start, then repeat on the other side
- Your lower back must stay pressed into the floor the entire time — if it arches, you've gone too far
- Common mistake: Letting the lower back arch off the ground. Reduce range of motion until you can keep it flat.
Forearm plank
- Forearms on the floor, elbows directly under shoulders
- Body in a straight line from head to heels — no sagging hips, no piking up
- Squeeze your glutes and brace your core as if someone is about to push you
- Breathe steadily — don't hold your breath
- Common mistake: Hips sagging or rising. Have someone check from the side, or film yourself.
Bird dog
- Start on hands and knees, wrists under shoulders, knees under hips
- Extend your opposite arm and leg to horizontal — reach forward and back
- Hold briefly, return to start, then switch sides
- Keep your hips level — don't rotate or shift to one side
- Common mistake: Rotating the hips as you extend. Imagine balancing a glass of water on your lower back.
Glute bridge
- Lie on your back with feet flat on the floor, knees bent, arms at your sides
- Drive your hips up by squeezing your glutes — straight line from shoulders to knees at the top
- Hold for a beat at the top, then lower with control
- Don't hyperextend your lower back — the power comes from your glutes, not your spine
- Common mistake: Pushing through the toes instead of the heels. Keep your weight in your heels.
Mountain climber
- Start in a push-up position, hands under shoulders, body in a straight line
- Drive one knee toward your chest, then return it and drive the other knee
- Alternate steadily — this is a core exercise, not a sprint
- Keep your hips level — don't bounce them up and down
- Common mistake: Letting the hips pike up with each rep. Stay in a solid plank position throughout.
Tips for success
- Move with control, not speed. These are stability exercises, not cardio. Slow, deliberate movement builds more core strength than rushing through reps.
- If your lower back hurts, check your form first. Most lower back pain during core work comes from poor positioning. If pain persists after correcting form, skip that exercise and substitute something else from the circuit.
- If you're also running, do core sessions on easy run days or rest days. Core work doesn't interfere with running the way heavy leg training can, but your abs may be sore for the first week or two.
- This pairs well with Runner's Strength. The two programs cover different muscle groups with minimal overlap. You can run both simultaneously if your schedule allows.
What's next?
After completing the 8-week program, you have three paths:
- Repeat at a higher level. If you started as a Beginner, run the program again at Standard. If you did Standard, add a 4th round to Weeks 5–8 for an extra challenge.
- Try a complementary program. The Runner's Strength and Plank Progression programs pair well with this one.
- Go adaptive. Pacewright Pro takes over where this plan ends — tracking your progress, adjusting difficulty in real time, and managing fatigue across your running and strength training together. Get notified when it launches.