"Slowly raise both heels and then quickly drop them back down."
"Gently raise your heels, and then with a thump, lower them down."
- "Slowly raise both heels and then quickly drop them back down."
"slowly raise ~" 「〜をゆっくりと上げ」
"both~" 「両〜」
"both heels" 「両足の踵」
"quickly drop them back down." 「ストンと下ろす」
- "Gently raise your heels, and then with a thump, lower them down."
"gently raise~" 「〜をゆっくりと上げ」
"your heels" 「自分の足の踵」(両足)
"with a thump" 「ストン」
"lower them down" 「下ろす」