There are different aspects of Arnis, depending on the style and tradition. Here are some of the aspects mentioned in the search results:

• Single stick training: This aspect involves the use of a single stick as a weapon in Arnis.

• Double stick: This aspect involves the use of two sticks as weapons in Arnis.

• Espada y daga: This aspect involves the use of a long blade and a short dagger as weapons in Arnis.

• Single and double knife: This aspect involves the use of one or two knives as weapons in Arnis.

• Staff: This aspect involves the use of a staff as a weapon in Arnis.

• Flexible weapons: This aspect involves the use of weapons that are flexible, such as ropes or chains, in Arnis.

• Sinawali: This aspect involves the use of two sticks of equal length twirled in a "weaving" fashion for blocking and striking.

Its worth noting that some sources mention three aspects of Arnis, while others mention more than four aspects. The number and type of aspects may vary depending on the source and context.