I bought this Walkman MP3 player primarily for use during running, walking, and other exercising. I have owned MANY MP3 players over the decades but this one is the best. It's the best fit, the lightest, stays in the ear the best, high-quality sound, plenty of volume, intuitive controls, and will hold much more music than I will ever load onto it.

This is the second Sony Walkman Sport that I have had. My first one lasted about 5 years which isn't bad when I swim with it on 2 to 3 times a week and tend to forget to take it out of my bag. This one is even better than the first. The newer design fits better and stays in my ears while swimming without having to be held on with my goggles. The battery life is good...I tend to recharge once every 2 to 3 weeks. The buttons on this are easy to navigate without having to remove the earbuds and look for them. There are audio signals for power on and power off as well as modes of play. I could do without the conversation mode, but I suppose if you were using them while jogging with a partner or where you wanted to be aware of traffic around you it may be helpful.

Ok, so I swim daily at 24 hour fitness. At minimum I swim a mile a day. And for the longest time I would get frustrated and bored about thinking of day to day stress. So I looked into the headphones and reviews out on the internet. All of them led to failure and no BIG company has the interest to make headphones waterproof for swimmers. So I'm so happy Walkman from Sony finally stepped up. The headset is good it works perfect under water. The only issue I've had is the ear piece. I think with a swim cap and the goggles i can hold them in place. But the second I go for the turn and push off. They fall off. But it still holds in place enough to hear the music. So there is that. Either way its really close to perfect. but needs some tweeking. All in all I love them. They charge fast and hold a good amount of music. It does come with a ton of bloatware but sony is known for that.

I use the headphones while running. With wired headphones, the cord is a nuisance and has to be attached to some sort of device (phone or mp3 player). Wireless headphones are a little better (no cord) but I'd still need to carry a device. Neither the wired or wireless phones will stay in my ears after I start to sweat. With these, I download what I want to listen to, copy it to the headphones, and the tension of the band keeps the speakers in my ears. After about an hour of running, they do get a bit uncomfortable due to pressure in my ears but it is tolerable. I have not tried them while lap swimming yet. Time will tell as to durability and how long they will accept and keep a charge.

I was lookiing for an mp3 player that I could use for running and found the Sony - Walkman NW-WS413 4GB* MP3 Player. This device is also able to be used while swimming. Device setup is relatively simple and storage is good. It has been excellent while on runs. It stays in place while on my head and holds a very good charge. I recommend it highly.