All participants in activities should have their own first aid kit and must bring any medications they may need.  What you include depends very much on the activity itself and how much you can carry:

*An outcome of a Ramblers Club incident was that if any chest pain is experienced, 300mg aspirin should begiven (to be chewed or held under the tongue) and an ambulance called immediately.  Aspirin thins the blood and will help alleviate symptoms and minimise damage if there are potential heart issues until proper medical evaluation can occur.  Note:  When dialling 000 explain concerns about cardiac arrest. Seek clear advice about administering aspirin as symptoms can be similar to stroke in some instances.  If possible check with the patient beforehand in case of possible allergic reaction or other blood thinners already being taken, eg Warfarin.