Zwift Pen Start Tactics: The Value and Execution of Exploding Watts in the First 30 Seconds

What is a Pen Start

5-10 minutes before a Zwift race begins, all participants are gathered into the Start Pen, and they are released together when the time comes. 0 wind resistance buffer, 0 inertia, accelerating instantly from a standstill.

Differences compared to outdoor racing:

Power Curve in the First 30 Seconds

Ideal Curve (Using FTP 250W as an Example)

Average power over these 30 seconds = 400-500W (160-200% FTP).

Why You Should Explode

1. The Non-Linearity of the Draft Effect

• Drafting in the pack saves 33% power
• Falling 50m behind → 0 draft, instantly costs 33% more
• Not keeping up within 30 seconds → the pack rides away

2. The Advantage of the Front 20% of the Pack

• Better visibility, can see attacks coming
• More opportunities to trigger Power-ups
• Positioning for sprint points

3. Psychological Advantage

• The first one past the 1km mark carries full momentum
• Opponents will start to doubt themselves

Preparation Before the Start

30 Minutes Before

• Warm up 20-25min, including 3×30s @ 150% FTP
• Bring heart rate up to 80% MHR
• Hydrate with 250ml

After Entering the Pen (5min Before)

• Maintain a light pedal at 70-80rpm, do not come to a stop
• Take the last sip of water
• Confirm Power-up keyboard shortcuts

Final 30 Seconds

• Bring heart rate up to 85% MHR
• Cadence at 80-90rpm
• Stand up and get ready

0 Seconds

• First pedal stroke is a heavy stomp to 800W+
• Stand and accelerate for 5-7 seconds
• Sit down and sustain high power

30 Seconds to 3 Minutes After the Start: Holding Position

You can’t drop off immediately after the explosion, or you’ll get overtaken:

• 30s-1min: 280-320W (110-125% FTP)
• 1-2min: 260-280W (105-110% FTP)
• 2-3min: 240-260W (95-105% FTP)
• After 3min: Settle at 220-240W (88-95% FTP)

Failure Case: Blowing Up at the Start

• Average 350W in the first minute (FTP 250W) → heart rate at 100% MHR by the 3rd minute
• Dropped from the pack at the 5th minute
• Spent the whole race solo, unable to chase back

Explosion limit: average no more than 180% FTP in the first 30s, and no more than 115% FTP in the first 3min.

Start Training Workout

Add Sprint Repeats once per week:

• Warm up 15min
• 8×30s @ 150-180% FTP, with 90s rest @ Z1 between intervals
• Cool down 10min

After 6 weeks, your starting ability will improve significantly.

Weight vs. Power Trade-off

Zwift climbing is about w/kg, but starting is about absolute watts:

• 70kg @ 500W = 7.1 w/kg
• 60kg @ 450W = 7.5 w/kg → loses at the start instead

So for Zwift flat and short-distance races, being heavier is actually an advantage.

The Pen Start is your ticket into Zwift racing; only once you master it do you actually have tactics to speak of.

Related Reading

• Zwift Racing Guide: Practical Strategies from the Start to the Finish Line
• Zwift Power-up Usage Timing: Complete Guide to Aero, Draft, Lightweight, and Steamroller
• Sprint Power Training: The Twin Engines of Peak Power and 30-Second Power
• Zwift Racing League Tactics: Complete Analysis of Grouping System, Pacing Rhythm, and Explosion Timing