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Swimming and cycling with Apple Watch

Different activities in the workout app in watchOS

Sep. 27, 2018
This month I tested the newest watchOS while swimming and cycling.

This month Apple launched a new Apple Watch series and released an update to watchOS. The focus of the smartwatch is more and more gearing towards health and fitness. This made me curious, how well does Apple Watch work for different activities?

Listen to your body

Why I stopped using health and fitness sensors

May 17, 2018
Using health data gathered by sensors and wearables I learned to listen to my body. Now I have stopped using bluetooth sensors all together.

A good customer of mine was once a physiotherapist, he told me about people asking him to "feel their muscles" to tell them how they where doing. "Crazy!" he told me: "I can never feel better than the people themselves, if they only would listen to their body". This caused me to question the health and fitness sensors I use.

Creating the ultimate commuter bike

Riding at 35KM/h with Nexus Alfine 8 and Gates Carbon Drive

Feb. 24, 2018
Creating the ultimate commuter bike by upgrading the Sensa Cintura belt drive bike.

This winter I use a Sensa Cintura bike with a Gates Carbon belt drive as my daily commuter. It's a bike designed to be nice to ride thanks to its sporty lightweight frame. It's also meant to be low on maintenance thanks to the belt drive and Nexus Afline 8 integrated gear hub. After 1800KM in just eight weeks, it was time for some upgrades.

Commuting by bike

One week (240KM) on the VanMoof Electrified S

Dec. 2, 2017
One week on the VanMoof Electrified S E-bike testing it for commuting and comparing it to a normal bike.

For a few years now, I commute to work using a bicycle. I have lost more than 15KG since I stopped using my scooter. This week I tested a VanMoof Electrified S, an electric bike with an industrial, minimal design. Is it any good? How does it compare to a normal bike? Will an electric bike make you lazy? Read along to find out!

Collecting health data with Biostrap

Wearing a clinical-grade photoplethysmography (PPG) sensor for a month

Nov. 15, 2017
Wearing a clinical-grade PPG sensor for a month to collect advanced biometrics from my wrist.

Most wearables (smartwatches, fitness trackers, etc.) use very basic sensors to capture heart rate. Their signal is binary: just counting beats. Biostrap is different, instead of just checking pulses, it captures a high-fidelity PPG waveform. These waveforms are the same kind that doctors use, making me wonder what I could learn from them!

Fietselfstedentocht 2017

Cycling the 235KM bicycle tour through Friesland

June 30, 2017
Cycling the 235KM long Fietselfstedentocht through Friesland

This month I cycled the Fietselfstedentocht, a 235KM tour through Friesland. This tour brings you through various Frisian cities throughout one of the most Northern provinces of the Netherlands. The tour was first organised in 1912 and has grown to become legendary due to its history, challenge and popularity; well worthy of a blog post!

Beast of the Green Hell

Driving the Mercedes-AMG GT R

May 31, 2017
Blog post about an amazing AMG Circuit day at the race track of Zolder, Belgium.

This month I received an invitation to join Mercedes at the Zolder circuit in Belgium to drive in "the beast". The Mercedes-AMG GT R, a furious green coloured performance car that gets its nickname from the Nürburgring where it was developed. It was an incredible experience, well worth a blog post!

One year of cycling

GPS recording an entire year of bike rides using Garmin and Strava

Dec. 31, 2016
GPS recording an entire year of bike rides using Garmin and Strava.

One year ago I started recording all my bike rides, including commutes, short grocery trips and long Gran Fondos. I equipped my bicycles with Garmin Edge computers that recorded location (GPS), speed, cadence and my heart rate. I covered more than 7683 kilometers during 320 hours of riding. It's time to review all the data and share some photos I took along the ride!

Batavus Champion bike from 1978

restoring retro glory with some help from the Internet

Sep. 3, 2016
Restore the retro glory of an old bike from the 70s using the internet.

Almost a year ago I bought an old steel racing bike from 1978. I wanted to figure out if using a bike to commute worked for me. It did! I used it to ride more than 1000KM before I decided to get a modern road bike. Now, almost a year later, I decided to put the powers of the internet into good use: to bring the bike back to its retro glory!

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4.0L V8 Twin turbo AMG engine
4.0L V8 Twin turbo AMG engine
Special support: my moms and her friend Albert
Special support: my moms and her friend Albert
Lock chain inside a small luggage compartment
Lock chain inside a small luggage compartment
The Biostrap PPG sensor is about as thick as a watch
The Biostrap PPG sensor is about as thick as a watch
The G-Class Professional is pretty hardcore
The G-Class Professional is pretty hardcore "function first"
The optional
The optional "bambooman" front carrier can be quite handy (photo from another bike, my VanMoof S5)
During autumn the days became shorter and many rides where done during dusk or dawn. It's nice to see the sun come up or go down.
During autumn the days became shorter and many rides where done during dusk or dawn. It's nice to see the sun come up or go down.
This pedal was new when I started, this is how thousands of kilometers cycling look like on a pedal.
This pedal was new when I started, this is how thousands of kilometers cycling look like on a pedal.
The Biostrap wrist PPG sensor next to a Swatch Sistem 51
The Biostrap wrist PPG sensor next to a Swatch Sistem 51
Apple HealthKit aggregating data from different sources and devices
Apple HealthKit aggregating data from different sources and devices
Finished! Collected all the stamps, earned the medal and a drink to celebrate an awesome day!
Finished! Collected all the stamps, earned the medal and a drink to celebrate an awesome day!
The metal fenders match well with the bike's disc and bolts
The metal fenders match well with the bike's disc and bolts
Front hub electric motor
Front hub electric motor
Not your average Taxi...
Not your average Taxi...
The Hurret rear derailleur (which was flown in from the other side of the world) fits nicely
The Hurret rear derailleur (which was flown in from the other side of the world) fits nicely
The pump fits well and I also managed to find a period correct plastic drink bottle
The pump fits well and I also managed to find a period correct plastic drink bottle
Out in the open: the Electrified S
Out in the open: the Electrified S

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