Apart from the powerup REViVAL there are no classic items in the maps to pick up to regenerate a players health energy. But there is a several amount of Health Stations in the maps to recharge health energy. The player needs to stand on a station while recharging takes some time. When health is fully charged the player receives an announcement.
The Health Stations do not have unlimited amount of health energy to give which is indicated by the size of the yellow cross. If a station is empty the cross is gone and it takes a minute to regenerate itself until it is ready to be used again. Also for that the player receives an announcement. To locate Health Stations more easy there is a heart icon which appears when the player is under 50% of health energy and is also visible through walls. This feature needs to be enabled in game options menu.