Be a Sport
February 8 is International Replace a Handshake with a Chest Bump Day - not National Replace a Handshake with a Chest Bump Day.
This could be a source of confusion if you live in an area where the handshake is not the normal form of greeting or agreement.
It seems that, for those who are used to the bow or the triple kiss, you are also permitted to substitute the chest bump for those activities in order to celebrate this special day. Otherwise it doesn't really make sense to designate an international version of this day.
If you're new to chest bumping, be a sport but be careful. A chest bump requires timing but doesn't have to be forceful. Take your cue from the other person involved, especially if it seems he or she is more experienced at this activity than you are.
It is possible to miss a chest bump. If that happens, don't be embarrassed. Just take a step back and give it another go. (I've never heard of a chest bump going bad twice in a row.)
Sometimes a chest bump is followed by a hug but don't feel compelled to add one to the process today. It's not required. There's nothing in the guidelines for this day that forbids you from adding a handshake at the end instead, if that makes you feel more comfortable.