Day 17: Core Blast
Every athletic movement your child will ever make starts from the center of their body. Sprinting, jumping, throwing, changing direction, all of it is initiated, stabilized, and controlled by the core. Not just the abs. The whole cylinder of muscles wrapping around the trunk, front and back and sides, that keeps the spine stable and transfers force between the upper and lower body efficiently. A runner with a weak core wastes energy with every stride.
Today's challenge is Core Blast.
Before You Start: Understand the Core. Before the workout starts take a moment to explain this to your family in the simplest possible way. Your core is every muscle between your hips and your shoulders. Not just the front of your stomach, all the way around. When your core is working properly your spine stays in one position no matter what your arms and legs are doing. When it isn't, everything else has to compensate. The cue that works for every age: imagine someone is about to gently poke you in the stomach. The slight bracing response that creates is your core turning on. Hold that throughout every exercise today.
Today's Workout: Core Blast
What you need: Any flat surface. A mat, carpet, or grass works well. No equipment required.
Total time: 15 to 25 minutes including warm-up, cool-down, and optional running add-on.
Warm-Up: 10 slow arm circles each direction. Cat-cow stretch (on hands and knees, arch your back up toward the ceiling, then dip your belly toward the ground). 8 slow repetitions. Then 10 hip circles each direction standing.
Block 1: Plank Hold: The foundation of core training. Forearms on the ground, elbows directly below the shoulders, body in a straight line from head to heels. Hold. No sagging hips, no piked hips. Everything in one line. Time it.
Block 2: Crunches: On your back, knees bent, feet flat on the ground. Hands behind your head or crossed on your chest. Lift your shoulder blades off the ground using your abs, not your neck. Lower slowly. That's one rep. Controlled the whole way, up and down.
Block 3: Superman Hold: Lie face down, arms extended overhead. Simultaneously lift your arms, chest, and legs off the ground and hold. This works the posterior chain, the lower back and glutes, which is the part of the core most neglected in traditional training and most important for running.
Block 4: Dead Bug Finisher: Lie on your back, arms pointing straight up toward the ceiling, knees bent at 90 degrees directly above your hips. Slowly lower your right arm overhead and your left leg toward the ground simultaneously, keeping your lower back pressed flat against the floor the entire time. Return and repeat on the other side. The lower back must not lift off the ground. That's the whole exercise.
Cool-Down: Child's pose, hold 30 seconds. Lying spinal twist, on your back, one knee crosses over the body, arms wide, hold 20 seconds each side. Cat-cow 5 slow repetitions to finish.
Age Modifications
🟢 Little Movers: Ages 3–5 | 8–10 Minutes
Block 1 is a modified plank, on hands and knees in a tabletop position, hold still for 10 seconds. That's their plank. 3 holds with cheering between each.
Block 2 is a crunch replacement, lie on their back and hug both knees to their chest, hold for 5 seconds, release. 5 repetitions.
Block 3 is Superman, lie on their belly and lift their arms out in front like they're flying. Hold for 3 seconds, lower, repeat 5 times. Make flying sounds.
Block 4 is optional, skip it if attention has run out. No running add-on needed today.
🟡 Kid Movers: Ages 6–8 | 15–18 Minutes
Block 1: plank hold from knees or toes, whichever is available, 3 holds of 20 seconds with 20 seconds rest between.
Block 2: 3 rounds of 10 crunches with 15 seconds rest.
Block 3: 3 rounds of 5 Superman holds, up for 3 seconds, down slowly, repeat.
Block 4: 3 dead bugs each side, slow and controlled, if the lower back lifts off the floor the movement is too fast.
Optional running add-on: after the cool-down jog ⅛ mile easy at a comfortable pace.
🟠 Preteen Movers: Ages 9–12 | 18–22 Minutes
Block 1: plank holds from toes, 3 holds of 30 seconds with 20 seconds rest. Round 3 add a shoulder tap, at the top of the plank tap one shoulder with the opposite hand, alternate, keep the hips still.
Block 2: 3 rounds of 15 crunches with 15 seconds rest.
Block 3: 3 rounds of 8 Superman holds, up for 2 seconds, down for 2 seconds, controlled throughout.
Block 4: 5 dead bugs each side, 3 rounds, lower back pressed to the floor the entire time.
Optional running add-on: ½ mile easy run after the cool-down.
🟣 Teen Movers: Ages 13+ | 20–25 Minutes
Block 1: plank holds from toes, 3 holds of 45 seconds with 15 seconds rest. Add a leg lift to the final hold, from the plank position lift one foot 2 inches off the ground, hold 3 seconds, switch. Keep the hips completely still.
Block 2: 3 rounds of 20 crunches with 10 seconds rest. On round 3 add a twist, bring each elbow toward the opposite knee at the top of each rep.
Block 3: 3 rounds of 10 Superman holds, 3 seconds up, 2 seconds down, full control.
Block 4: 8 dead bugs each side, 3 rounds, slow and deliberate. This is the hardest block of the day and the most important one for running performance.
Optional running add-on: ¾ mile easy run after the cool-down.
👨👩👧 Parent Bonus | 18–22 Minutes
Block 1: 3 plank holds of 45 seconds from toes. Add a shoulder tap in rounds 2 and 3.
Block 2: 3 rounds of 15 crunches with a twist, elbow to opposite knee every rep.
Block 3: 3 rounds of 10 Superman holds.
Block 4: 8 dead bugs each side, 3 rounds. The dead bug is the exercise physical therapists prescribe most often for lower back pain, if your lower back has been bothering you this summer pay particular attention to this block.
Optional running add-on: ½ mile easy run after the cool-down.
The Optional Running Add-On
Little Movers: no add-on needed today.
Kid Movers: ⅛ mile easy jog after cool-down.
Preteen Movers: ½ mile easy run after cool-down.
Teen Movers: ¾ mile easy run after cool-down.
Parents: ½ mile easy run after cool-down.
Keep it easy. This is aerobic maintenance on a strength day, not an additional workout.
Did You Know?
A strong core reduces running injury risk significantly. Research published in the Journal of Athletic Training found that runners with measurably weaker core stability had significantly higher rates of IT band syndrome, patellofemoral pain, and lower back pain than runners with stronger cores. Core strength doesn't just make runners faster, it keeps them healthy enough to keep running. Today's workout is injury prevention as much as it is performance training.
