I'm having the same problem with a MARQ. The first day I had it I created a run/strength multisport; the next day the option was gone. I reset to factory default, and still not there.
Do Garmin representatives ever comment on this forum - this is a long time with no answer? Did anyone find this query in another forum?
Are you using the following steps to create your own custom multi-sport? - Creating a Multisport Activity.
If the issue continues, please fully reset your watch - How to Reset the MARQ
Since you have the MARQ watch, I've moved your post to the MARQ series forum, where Garmin - Chris would be more likely to see this.
