The Bouncer: Excessive Vertical Movement

What This Looks Like

You go up and down more than forward. From the side, your head bobs noticeably with each stride. You're working hard, but a significant chunk of that effort is wasted fighting gravity rather than covering ground. Running feels effortful even at easy pace — not because you're unfit, but because your mechanics are sending energy in the wrong direction.

This is common if you push off too hard with each step, you have poor trunk control (a "collapse and rebound" pattern), you came from sports with a vertical emphasis like basketball or volleyball, or your calves are overactive while your glutes are underactive.

There's some overlap with the Stomper — vertical oscillation and heavy contact often coexist. The difference is what you notice most: Stompers feel the impact, Bouncers feel the bobbing.

What's Actually Happening

For every centimetre of unnecessary vertical displacement, you have to absorb the landing force and redirect it forward again. It's metabolically expensive and mechanically inefficient:

Excessive push-off. You're driving too hard off the back foot, launching yourself upward. Efficient running uses a quick, elastic push-off that redirects mostly forward. You tend to push up and back.

Poor trunk control. If your core can't maintain a stable trunk, your pelvis drops and rises with each stride — a "sitting and standing" pattern that amplifies vertical movement.

Slow cadence contribution. Lower step frequency means longer ground contact, more time to apply vertical force, and longer flight phases. Higher cadence naturally reduces flight time and vertical displacement.

Arm mechanics. Inefficient arm swing — too wide, too high, crossing the body — can drive you upward instead of forward. Arms should counterbalance rotation and assist forward momentum.

Misdirected elastic energy. Your tendon-muscle system is pushing you up rather than deflecting you forward. You're actually powerful — you just need to aim that power horizontally.

The key insight: the fix isn't "run flatter." That cue feels unnatural and usually just makes runners stiffen up. The real fix is redirecting your existing effort forward through better posture, trunk control, and turnover.

Before Your Runs

Pre-run drills set up the postural framework before you start running:

1. Posture drills — tall running drill, short bouts of hands-overhead running — establishing the trunk position from the start
2. Arm swing drill — isolated arm drive practice, patterning forward-back motion instead of up-down
3. Elastic control — ankling, fast feet — emphasizing quick, low contact rather than big push-off
4. Coordination — A-march with arm drive — integrating upper and lower body timing

After Your Runs

Post-run strides emphasize forward flow:

1. Classic strides — smooth accelerations with a focus on gliding rather than bouncing
2. Cadence-focused strides — higher turnover naturally reduces vertical oscillation
3. Drill-to-run carryover — reinforcing patterns from the pre-run session

What Your Plan Avoids

Bounding and plyometric-heavy sessions. These emphasize vertical displacement and flight time, which reinforces your problem. They're introduced carefully, only after your posture work is established.

"Stay low" cues. Runners who try to suppress their bounce often stiffen up and lose natural elastic return. The goal is to redirect, not suppress.

Ignoring arm mechanics. Arms are often half the problem. A cross-body arm swing or high elbow carry will keep you bouncing no matter what your legs do.

Signs to Watch For

Feeling exhausted on easy runs despite adequate fitness? Vertical oscillation is metabolically expensive. If you're fitter than your easy runs feel, this is likely why.

Visible head bob at easy pace? Start with posture drills — tall running, arm swing — before any elastic work. The postural foundation comes first.

Very slow cadence (below 165 steps per minute)? Cadence work may give you the fastest improvement. Higher turnover naturally reduces flight time.

History of calf or Achilles issues? You may be pushing off too hard. Elastic drills should stay low-amplitude — pogos and ankling rather than bounding.

If You Also Fade Under Fatigue

When fatigue accumulates, your vertical oscillation amplifies. Posture collapses, the trunk sinks, and push-off forces become increasingly vertical. The head-bob that was subtle at the start becomes pronounced by the second half.

Your post-run strides shift to deliberate posture resets. The cue is "stand tall, arms back" — consciously resetting trunk position and arm mechanics when your body wants to sink and bounce. Posture over pace on these strides. Your pre-run posture drills become the explicit reference point: "this is the position I'm maintaining today."

How Strength and Mobility Help

Strength: Core anti-extension and anti-rotation work — plank variations, Pallof press — directly supports the trunk control needed to reduce vertical oscillation. A stable trunk doesn't bob.

Mobility: Thoracic spine mobility helps with arm mechanics and tall posture. A stiff thoracic spine limits shoulder range, forcing compensatory arm patterns that drive you upward instead of forward.