Quick Answer
The slots split the evidence: mornings win adherence (fewer schedule collisions), appetite-regulation signals and circadian alignment with morning-caffeine routines; late afternoons win raw performance (body temperature and strength peak). The tiebreaker is brutal adherence math: your best slot is the one that reliably happens.
Each Slot's Honest Case
Morning's portfolio: the day defends it (6 AM meetings are rare; 6 PM collisions constant — adherence data consistently favors early), appetite research adds signals of better daily regulation after morning sessions, the light exposure moonlights for the circadian guides, and the slot pairs naturally with morning-caffeine routines — the pre-workout coffee-and-dropper stack timed exactly as the half-life math wants.
Evening's counter: performance physiology peaks late afternoon (body temperature, strength and power metrics all favor it), sessions double as workday decompression, and social-training culture lives there. The costs trade too: morning's grogginess ramp versus evening's collision-and-cancellation exposure and the late-vigor sleep questions.
Running The Tiebreaker
The deciding audit: past attempts. Your history of cancelled evenings votes morning regardless of performance charts; a genuine night-owl chronotype with protected evenings votes late. The consistency evidence overrules optimization as always — the slot that survives your worst weeks is the answer, and split approaches (weekday mornings, weekend flexibility) serve many lives best.
Slot-specific tactics seal it: morning people prep the night before (clothes out, the boot-sequence protocol) and ride the caffeine timing; evening people book sessions as meetings and keep vigor two-plus hours from bed. Both slots keep the daily walk besides. The best workout time remains the most boring answer in fitness: the one that happens.
The Product Layer, Briefly
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Keep reading: the complete SodaFit primer · the expectations calendar.
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