Group Outdoor Fitness business needs a minimalist, simple design that could double as an app icon

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Logo-Design Kurzbeschreibung
Our business provides small group outdoor fitness training, Our aim is to coach our clients to significantly improve and maintain their health, through outdoor training.
Key themes / values of our business are:
1) Simplicity
2) Discipline
3) Transformation
4) Hard Work
5) Integrity
6) Class
It would be great to have something really simple, single colour, that prints easily on a t-shirt (same logo but be able to print it in different colours), and could also double for an app logo (i.e. fits in a square).
One idea I had was a logo that is half one image on the left and half another image on the right that is joined together as one image (however a little space in between is also OK if that presents better). E.g. half a rock (outline) on the left next to a half emerald outline) to the right to signify the 'before' (rock) and 'after' (emerald) as clients carve away the unhealthier habits (rock) into emeralds (improved fitness). But a very basic, minimalist, and classy design, mostly in the colour bright mint green (i.e. similar to an emerald with light running through it). Included or alternative colours could be white, black and/or grey.
Images to avoid in the logo:
1) Animals
2) Fun
3) Cartoons
4) Fitness Equipment (we're mostly body weight - minimal equipment)
I've attached our current Logo as an example (I like it's simplicity, however it's too generic / looks like the Microsoft Word Clip Art Diamond).
Thanks in advance for your work/submission!
Logo Text
Emerald Fitness (or just "Emerald") - however with the wording separate to the image in the logo