The present invention resides in an exercise device that is lightweight and easy to transport, and is particularly effective in improving neuromuscularproprioceptive coordination, balance and core strength. In some embodiments, these techniques and apparatuses enable multi-application environments having combinations of immersive interfaces, windows-based interfaces, and a desktop treated as an immersive interface. The microprocessor generates a control output signal in response to the serial signal. The members connect with positioners interlocking with notches on adjacent members. Compositions of the invention can be used as pharmaceutical agents to treat various diseases such as those caused by viruses and can be used for diagnostic purposes in order to detect viruses or disease conditions.