Does Blocks work with Garmin today, and how?

Yes, Blocks reaches Garmin through intervals.icu: Connecting intervals.icu to both Blocks and Garmin Connect lets planned workouts travel from Blocks to the watch or Edge through intervals.icu’s Garmin sync, with finished activities coming back the same way. You can also download any workout as a .FIT file and copy it to the device over USB. A direct connection is possible once Garmin reopens its developer program.

Does an athlete need their own AI subscription to use Blocks?

No, the assistant is built in, and new accounts start with tokens. Connecting Claude or another MCP client is optional for athletes who already spend their day in that chat.

Will the AI change a training plan without asking?

No, in Blocks every change arrives as a card with an Apply button, and in an athlete’s own AI, the agent names the change and asks first. Nothing is written until the athlete agrees.

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Blocks: an AI-native training platform for endurance athletes

23 September 2026

the5krunner

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Blocks is a training platform built for AI. Build workouts with an assistant that reads the…