If you are serious about your training, you may want to invest in a sport watch. With a weight of 67 g it you will hardly notice that you are wearing it.
From Blacks
Instinct 2X Solar Multi-Sport GPS Smartwatch - One Size
The product is available from £304.30 at international stores.
King of Watersports
Garmin Instinct 2X Solar
This product is also available at 1 unverified merchant.
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