The five elements -- fire, earth, water, air and ether -- are characterized by the three gunas. Each guna is associated with certain characteristics:
- Tamas: Negative energy and inactivity
- Rajas: Frenetic energy
- Sattva: Intelligence
Higher levels of heat energy and movement are associated with rajas. It represents the quality of action. Those with a dominant rajas in their nature (rajasic individuals) are energetic, enthusiastic and ambitious.
Foods can also be classified based on their nature. Rajasic foods are sour, bitter and/or hot. They have a stimulating effect on both the body and mind, causing the mind to become restless.
In yoga, the individual can stimulate the rajas guna by engaging in a rajasic asana practice. This is any sequence that forces the body to move and remain energized, such as a vinyasa style of yoga.