Closeup of bright green slack line and ratchet on slightly windy but very sunny day

slackline slacklining slack line green tightrope balance test climbing balancing balance tie tension trees tighten slack home exercise active bush activity bushes jitter tree windy grass exercise sun sport sunny bright home fitness excersise stretch sky blue sky barn physical shed leaves wobble wobbling closeup birch tight blue taught ratchet silver silver birch barefoot