you often use treadmill, you can choose normal walk speed or jog speed.
If you have no experience or can't make sure the best testing speed, you can reference
belowstandard:
Speed 0.8-3.0 km weak constitution people.
Speed 3.0-4.5 km sedentary or not often exercise people.
Speed 4.5-6.0 km walking quickly people.
Speed 6.0-7.5 km fast walk people.
Speed 7.5-9.0 km jogger.
Speed 9.0-12.0 km intermediate speed runner.
More than 12.0 km excellent runner.
ATTENTION:It is suitable for walker to choose less than or equal to 6 km speed.
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