Ding ding ding, you said the magic word: Filters
Regarding the last, Filters are the main drawback of this app all and all!
not only for challenges, but for sorting workouts, sorting cooldowns, warmups and such…
Eben the create your own workout, is as dumb as it can be, not being able to sort or filter types of equipment and muscle groups.
look at the thread I opened regarding create your workout
look at this thread regarding Better use of community feature
and look at this thread regarding Filter and sorting system
All of them are necessary and on the same subject we all complain