Core30 Days
30-Day Core Challenge
A month-long core routine combining planks, crunches and leg raises, with targets that increase week by week. One rest day is built into every week.
Who It's For
Anyone wanting a focused, no-equipment core routine to build into an existing habit or as a short daily add-on to another workout plan.
Log in to track your daily progress on this challenge.
Log InDaily Targets
Day 1Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 2Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 3Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 4Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 5Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 6Plank 20s · 10 Crunches · 10 Leg RaisesHold a plank for 20 seconds (split into 2 holds if needed), then 10 crunches and 10 leg raises. Rest between exercises as needed.
Day 7Rest DayRest, stretch lightly, or take an easy walk. Recovery is part of the program — skipping it does not speed up progress.
Day 8Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 9Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 10Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 11Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 12Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 13Plank 30s · 15 Crunches · 12 Leg RaisesHold a plank for 30 seconds (split into 2 holds if needed), then 15 crunches and 12 leg raises. Rest between exercises as needed.
Day 14Rest DayRest, stretch lightly, or take an easy walk. Recovery is part of the program — skipping it does not speed up progress.
Day 15Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 16Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 17Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 18Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 19Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 20Plank 40s · 20 Crunches · 15 Leg RaisesHold a plank for 40 seconds (split into 2 holds if needed), then 20 crunches and 15 leg raises. Rest between exercises as needed.
Day 21Rest DayRest, stretch lightly, or take an easy walk. Recovery is part of the program — skipping it does not speed up progress.
Day 22Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 23Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 24Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 25Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 26Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 27Plank 50s · 25 Crunches · 18 Leg RaisesHold a plank for 50 seconds (split into 2 holds if needed), then 25 crunches and 18 leg raises. Rest between exercises as needed.
Day 28Rest DayRest, stretch lightly, or take an easy walk. Recovery is part of the program — skipping it does not speed up progress.
Day 29Plank 60s · 30 Crunches · 20 Leg RaisesHold a plank for 60 seconds (split into holds if needed), then 30 crunches and 20 leg raises.
Day 30Final Day — Beat Day 1Repeat Day 29's target one more time, and notice how much easier your Day 1 numbers feel by comparison.
How to Follow This Challenge
- Do the three exercises in order: plank, then crunches, then leg raises, resting between each as needed.
- Split a long plank hold into two shorter holds if you can't sustain it in one go — the total time is what matters.
- Keep movements controlled rather than fast — a slower crunch or leg raise works the muscle more than a fast, momentum-driven one.
- Rest days are a full day off from the routine, not just a lighter version of it.
Safety
- Stop if you feel sharp pain in your lower back — this usually means the core isn't controlling the movement and the lower back is compensating.
- If you are pregnant, postpartum, or have an existing back condition, check with a healthcare professional before starting.
- Keep your lower back gently pressed toward the floor during crunches and leg raises rather than arching it.
Frequently Asked Questions
Bend your knees slightly and only lower your legs as far as you can while keeping your lower back flat against the floor — range of motion matters less than keeping the back controlled.
Visible ab definition depends mainly on overall body fat, which is driven by nutrition and total activity — this challenge builds core strength and endurance, which is a real and separate benefit regardless of visible definition.
Yes — it takes only a few minutes and pairs well as a short add-on to any of our workout plans.