Play on one side of the game pad. You only need to focus on five keys. Usually, every player start with playing single at first to get familiar with the position of each key and how to step accurately. Being accurate here is not referring to the game score system that involve perfect, great, good, and so on, but I'm referring to the accuracy of your step on the physical key itself. No matter how well we can play, we might mistakenly step on the edge of the key and miss the notes, especially on songs with higher level difficulty where we need to step really fast and when we need to perform Twist.

When playing on single mode, one of the way of training for many players where you might not be able to notice is the training to conserve energy and stamina. Let's face this, when we push our self very hard and consume a lot of energy playing on one song, we get exhausted really fast even though most of the song durations are around 2 minutes to 2 & half minutes long except for full songs and remixes. If you fail to conserve and spending too much energy, you get really tired and just hope that the song end quickly. That's make you unable train with a correct manner because you need to train the accuracy and skills, which required a proper flow of breathing and energy as you play.

How to conserve energy? Here is the practical way in details from my experience. First you need to maintain a proper standing stance, with your knee slightly bend down but not too much, you don't want to look like a froggy man walking with two legs. Your upper half of the body should be straighten, try not to bend down unless you need to speed up really fast. But maintain a straightening upper body afterwards. This is crucial because the gesture of your upper body helps to reduce the strength that your leg need to takes when it step around. You can experiment this by standing on a flat floor, randomly move around your leg imagining you are stepping on the five keys. Try both stepping randomly with a straighten upper body and with your upper body bend down a little, then see which one make you feel tired sooner.

As for your lower body part, you just need to ensure your leg is at a proper position. As mentioned earlier, you need to bend your knee a little so that you be well prepared to twist, run faster and so on.

About the hand? Just make sure your hands hold tight on the bar and do not easily release the bar before the song finish. Release the bar only when you are very sure that the song is finish. I seen people who switch several times from holding bar to no bar, then hold bar again. I can't say you won't be able to train in such a way. But releasing the bar and hold it back afterwards give you the chance to lose grip of the bar because you don't have an eye on your back, you need to wander your hand on the back for awhile to grab to bar properly and that will result in losing balance, thus giving you a high chances of losing accuracy and miss many notes.

The obvious differences is that, you need to step on ten keys compare to five keys in single mode. But that's only covering the surface. Double mode is something very different. Able to play single very well doesn't guarantee you to be able to play fine in double, because the way to practice your skill in double is totally different.

The first thing you need to know about playing double is the position of your body on the game pad. The proper position of your body should be on the center of the game pad. Then, hold the left bar with your left hand and hold the right bar with your right hand. Sounds too basic and seems needless to mention about this? Well, I seen people who hold only one side of the bar and play double. That's making their way of stepping notes looks really awkward and difficult. There are also people who hold only one side of the bar with both hand all of a sudden, and then try to move their body to another bar and grab the other bar with both hand. Again, I can't say you definitely can't train in that way but I see more bad than good playing in such way. Not only you will feel really hard for your body to maintain at a proper position for playing double, you feel even more difficult to step properly and miss more notes when you can't even maintain your balance while holding bar.

I would suggest to practice holding bar when you playing double often. Although it sounds too basic, but it's a crucial method to ensure you able to step the ten notes in a correct way and perform the skill in double properly. To practice this, just keep these in mind when you are playing double:

i) Hold left hand on the left bar and right hand on the right bar. Hold tight and do not let go until you sure that the song is finish.

ii) Maintain your body on the middle of the game pad. Try not to move your body too much to the side.

iii) Bend your knee a little and imagine your leg should run around the ten keys. Your leg is the one that suppose to do all the running and stepping.

Anything else? That's cover what you should do when you are playing double but of course, that's just the basic that you need to master. Here's one factor you need to consider, level 15 single and level 15 double is very different not only the number of keys and how your body position should adapt to, the main thing here is stamina. Double is more breath and stamina killing because you need to use more energy from your upper body to move from left to right and another way round. So conserving energy is much more crucial for double.

Try to reduce the speed and maintain at a speed where you can see the notes really clear instead of trying to catch the notes with all your breath when playing double. For example, for a song with BPM 140, you can read the notes clear with speed 4.5. But for double, speed 4.5 could be too fast for you, so try to set speed 4. You might find it a little slow and you wish that it's a little faster, but the key here is to ensure you can really read the notes clearly in order to finish the entire song, instead of losing all your breath in the middle of the songs, playing well in the beginning but unable to play the rest of the songs. This is because faster speed required you to catch the notes faster, and kill your stamina much faster.