As of 2024, Holder is the reigning female African Continental Champion in women's speed climbing, and she is representing South Africa in that discipline at the 2024 Summer Olympics.

Soon after partially healing from that injury, Holder dislocated her elbow while bouldering, which necessitated five months' rest to rehabilitate.

[3] Her coach, Jay-D Muller, suggested that she try speed climbing as a less painful and less injury-prone alternative to boulder and lead.

[1] Holder won first-place in the International Federation of Sport Climbing (IFSC)'s 2023 African Continental Championship, but initially began training for it without realizing the event was a qualifier for the 2024 Summer Olympics.

[5] Holder is the only woman representing an African nation in the speed climbing event at the 2024 Paris Summer Olympics.