Climbing steep grades requires practice. And pacing. And adequate gearing. And patience. And some technique.
If you're forced to slalom across the road, your gearing is too high, or you don't have adequate standing skills.
When climbing a very steep grade out of the saddle, it should feel like you are slowly climbing stairs. If it feels like you're running up stairs, you're probably going harder than you can sustain.
Take it slow.
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Ride, Rest, Repeat. ROUVY:
terrymorse