When a friend's training performance alert that you share with you appears and you tap "Reply", there is a choice of automatic answers. Some are sassy, some are fine. You can see these answers later in iMessage.
For example, I went on an indoor tour, my friend's auto-reply "You have to get out more."
Others include "Thank you for the low line", "Unimpressed" 19659002] Some nice ones include unicorn emojis, star emojis and other encouraging messages. But I choose the sassy ones because they are fun for my friends and I.