With such huge strides made in underwater music player technology in the past decade, listening to your favourite music while training is no longer a luxury limited to land-based athletes.
For many years, runners and cyclists have been able to listen to songs or podcasts while they train on the road or in the gym.
But with the rise and development of underwater MP3 players during the past 10 years, swimmers can now also take their favourite tunes or podcasts with them when they get into the water.
Below, we take a look at the benefits of training with music, and explain why the FINIS Duo Underwater MP3 Player is our number one choice for waterproof music player.
How an underwater MP3 player can help swim training
According to Jenny Markell at the National Center for Health Research, listening to music during exercise can do so much more than simply relieving boredom.
"It can help improve the quality of your workout by increasing your stamina and putting you in a better mood," says Markell.
"In particular, music that is motivational or synchronized with your exercise is shown to have physical and psychological effects. When a song has a strong, steady beat, for example, you can pedal or run to the beat of that music, which tends to feel satisfying and may inspire you to exercise more.
"The lyrics or catchy rhythm of motivational music inspires you to exercise longer or work harder during your exercise routine."
The principle is exactly the same in the water. Towards the end of a long session, when you're getting tired and bored, hearing a few of your favourite songs may just inspire you to push on and complete those extra few lengths. You may also find tunes with a rhythm that helps your stroke technique or timing.
FINIS Duo Underwater MP3 Player – our top choice
FINIS are well known for their excellent swimming aids, and they've been at the forefront of developing swimmer-friendly underwater MP3 players over the past 13 years.
The FINIS Duo Underwater MP3 Player is their latest and most impressive waterproof music player yet. One of its main advantages is that it doesn't use ear buds, which have been known to fall out of ears easily during swimming. Instead, it features a clip design that attaches securely and comfortably to your goggle strap.
FINIS have also been developing 'bone conduction audio transmission' which enables the FINIS Duo MP3 player to deliver crystal-clear audio through the cheekbones to the inner ear.
This has been developed to give swimmers a higher quality of sound, both when they are under water and also above the water.
How many songs can the FINIS Duo MP3 player hold?
The FINIS Duo Underwater MP3 player has an impressive 4GB of storage, which means you can store up to 1,000 songs or up to 60 hours of playback.
It supports unprotected MP3 and WMA audio files, which means you can listen to music, podcasts or audiobooks while swimming.
How can I select songs on the FINIS Duo MP3 while swimming?
The FINIS Duo has a simple interface with four buttons, meaning swimmers can quickly and easily switch between songs or podcasts in between lengths.
There are one-touch buttons to adjust volume, skip tracks or replay them. There is also a random play option that can be switched on or off by holding the button for three seconds, which is perfect for those who like a 'shuffle' feature.
How long will the FINIS Duo MP3 player last?
The built in rechargeable battery will run for up to seven hours after a full charge. It has a USB magnetic dock for transferring files and charging.
The FINIS Duo Underwater MP3 Player definitely goes the distance, and is an extremely popular choice among customers with a series of glowing reviews.
Long distance swimmer Diana Nyad, who became the first person to swim 110 miles from Cuba to Florida without a shark cage, is one of many to use the FINIS Duo in the water.