For gymnastics floor routines lasting up to 90 seconds, which sequence best describes how energy is supplied during the effort?

• A. Aerobic energy throughout
• B. Anaerobic energy with ATP/PC in the first 10 seconds followed by anaerobic glycolysis
• C. Lactic acid system only
• D. Stored ATP only

Answer: (B)

When a high‑intensity gymnastic floor routine lasts about 90 seconds, the body relies on anaerobic energy systems to meet the demand. The body first taps into existing ATP and a small amount of phosphocreatine (ATP/PC) for the initial burst—roughly the first 10 seconds. Once those stores are used up, energy is mainly supplied by anaerobic glycolysis, which breaks down glucose without oxygen to keep producing ATP for the next portion of the effort. While the aerobic system does begin contributing as time goes on, it isn’t the primary source within this 90‑second window, and stored ATP alone would not sustain the effort. So the sequence of ATP/PC usage in the first 10 seconds followed by anaerobic glycolysis best describes how energy is supplied.