HIIT (12)

HIIT, or high-intensity interval training, alternates short bursts of effort with rest breaks. A HIIT workout may be built from running, cycling, jumps or bodyweight exercises, and a session is usually shorter than a classic strength workout. The trainer sets the length of the intervals and makes sure your technique holds up as you tire.

Interval training suits people who are short on time and want to build endurance and vary their usual routine. Beginners are advised to start with longer rest breaks and simpler exercises, while more experienced exercisers can lengthen the work periods. Because the load is high, the body needs recovery between HIIT sessions.

HIIT trainers run group classes, small groups and personal training. Before you start, ask whether the class is held in a studio, outdoors or online, which level it is meant for and whether the trainer offers a quieter alternative to jumps if your knees or neighbours require it. Tell the trainer about any past injuries as well.