Inclusion Criteria:  18 to 45-year-old men; Be able to run continuously for 1 hour; Body mass index between 18.5 and 29.9 kg/m2; No known contradictions to maximal exertion exercise (e.g., recent musculoskeletal injury, congenital heart disease).  Exclusion Criteria:  Musculoskeletal injury that has affected normal ambulation within the last month; Uncontrolled exercise-induced asthma; Coagulation or bleeding disorders; Heart conditions; Diabetes (metabolism will be different to non-diabetics potentially skewing the data); Taking any medication that might influence fat metabolism, blood glucose or appetite; Smoking (including vaping); Dieting or restrained eating behaviours; Weight fluctuation greater than 3 kg in the previous 3 months to study enrolment; Presence of any diagnosed sleeping disorder; A food allergy.