Advisor
Energy System Rest Advisor
Match the rest interval to the actual demand of the set. Pick the exercise profile, training goal, and intensity band to see which energy systems dominate and how long to wait before the next effort.
Recommended rest
3:00
Heavy compound work with high neural demand benefits from fuller ATP and nervous-system recovery.
Launch this timerATP-PC
50%
Glycolytic
35%
Oxidative
15%
Recovery profile at the recommended rest
Frequently Asked Questions
Which energy system does my exercise use?
Efforts up to about 15 seconds run on the ATP-PC system. Roughly 15 seconds to 2 minutes is dominated by the glycolytic system. Beyond 2 minutes the aerobic system takes over. Most lifting sets fall in the first two, which is why rest between sets is measured in minutes rather than seconds.
How long does each energy system take to recover?
ATP-PC needs 3 to 5 minutes for near-complete recovery. Meaningful lactate clearance after glycolytic work takes 3 to 5 minutes as well, though you rarely want full clearance for hypertrophy. The aerobic system recovers continuously and is what powers the other two between sets.
Why does matching rest to the energy system matter?
Because each system refills on its own timeline. Resting 60 seconds after a maximal set leaves the ATP-PC system at roughly 85%, so the next set starts at a deficit. Matching rest to the system you actually taxed is what keeps performance consistent across sets.