The punch techniques in muay Thai were originally quite limited being crosses and a long (or lazy) circular strike made with a straight (but not locked) arm and landing with the heel of the palm. Cross-fertilization with Western boxing and western martial arts mean the full range of western boxing punches are now used: lead jab, straight/cross, hook, uppercut, shovel and corkscrew punches and overhands as well as hammer fists and back fists.