Flapp
Flapp Academy

Train the technique,
not just the miles

Evidence-based guides on running form, running economy, cycling position and aerodynamics — the science behind what our analyzer measures.

Bike Aerodynamics

Aero Position: Where Your Speed Actually Hides

At racing speed most of what slows you down is your own body, not your bike. Here is what the wind-tunnel evidence says about torso angle, CdA and how much a better position is really worth.

8 min read
Running Form

Running Cadence: Why 180 Isn't a Magic Number

What running cadence actually is, how it changes the forces on your body, and how to raise it safely without wrecking your form — the evidence behind the '180 spm' rule of thumb.

8 min read
Bike Position

Cleat Position: What the Research Actually Says

Fore-aft, rotation and stance width — a practical, evidence-based guide to setting up your cycling cleats. What the studies show about foot pain, economy and the triathlon myth, and how to change position without wrecking your fit.

10 min read
Running Form

Foot Strike: Heel, Midfoot, Forefoot — and Why It's Not the Whole Story

The honest version of the foot-strike debate: what heel, midfoot, and forefoot landing actually change, why 'switch to forefoot' is bad advice on its own, and what your strike is really telling you about the rest of your form.

9 min read
Running Economy

Ground Contact Time: How Long Your Foot Stays Down — and Why It Matters

What ground contact time measures, why less time on the ground usually means more efficient running, and how it's really a mirror of your cadence and landing rather than something to train directly.

7 min read
Running Form

Overstriding: The Braking Force Hiding in Your Stride

What overstriding actually is, why a foot that lands ahead of your hips brakes you on every step, and the simple cadence-and-posture fixes that pull your landing back underneath you — with the biomechanics behind it.

8 min read
Running Economy

Vertical Oscillation: The Bounce That Costs You Nothing to Fix

Why bouncing up and down wastes energy that could move you forward, how much vertical movement is normal, and the simple cue-and-cadence changes that flatten your stride — the evidence on running's most visible inefficiency.

7 min read
Bike Position

Short Cranks: Why the Pros Went 165 mm (and It Isn't About Your Legs)

The short-crank trend that swept the 2025-26 pro peloton isn't about leverage. It's a fit change that opens your hip angle, lets you get lower, and helps you breathe — here's the evidence and how to switch without wrecking your position.

9 min read