How do you delete an exercise

I created an entry/exercise then decided on a better entry but how do I delete the exercise from my day?The gym workout I wanted to enter was not on the list so I made one that I no longer need so it is still on my day as if I did a 2 hour not a 1 hour work out.
I find the list really limited in terms of gym classes. For example, there are no LesMills entries, or Step, or Camp24.
--Thanks

The time will always have to add up to 24 hours, so to eliminate a workout, you have to replace it with something. If you want to reset it back to Resting, then open the pull-down menu for that activity, say "reduce" by the same amount of time you put in, and fill in "replace with" Resting. To just change the time from one hour to two, put "reduce" by "1 hour," "replace" with "resting," and it should leave just one hour of the activity.

I understand the desire for more categories. As long as you can approximate your calorie burn, just find the closest activity that gives the same burn rate and use that. (It's understandable, given the difficulty of collecting enough data to determine a burn rate for every possible gym class!) It's actually surprising how similar most activities are in terms of what they burn.

Alternately, if you want accuracy for your own records, you can use the "Other" selection and fill in your own activity names and the calorie burn for each.