Since you're still getting to know each other and he's been a bit vague about his interests, you’ll want to keep the gift simple but thoughtful, something that feels personal without being too over the top.

Here are a few ideas:

1. Fitness-Related Items

Since he enjoys running and going to the gym, you could consider something related to those activities:

Running Socks: High-quality, moisture-wicking socks are a great, practical gift.

Water Bottle: A durable, stylish water bottle that he can use while working out.

Gym Accessories: Think about something like a gym bag, a resistance band set, or a towel with his initials.

2. Personal Care/Wellness Gifts

These gifts are useful and thoughtful without being too intimate:

Athletic Skincare Products: A set of skincare products designed for active people, like post-workout face wipes or body scrub.

Massage Ball or Foam Roller: Great for muscle recovery after workouts and something he can use regularly.

3. Gift Cards for Experiences

If you're unsure about specific items, a gift card to something he might enjoy could still feel personal:

Sports Gear Store Gift Card: Since you know he likes running and the gym, a gift card to a store where he can pick out gear might be perfect.

Experience-Based Gift Card: If you know of any local activities or experiences he’d enjoy, like a ticket to a sports event, a race entry, or a pass to a climbing gym, this could be a fun option.

4. Something Thoughtful but Low-Key

Personalized Water Bottle or Tumbler: You can have it engraved with a simple message or his initials.

A Book or Journal: If he’s someone who enjoys reading or journaling, find something related to his interests or a self-improvement book about fitness or wellness.

5. Simple Yet Meaningful

If you want to avoid going overboard but still show you’re thinking of him, you could also consider:

A Nice Card: Expressing your appreciation for him, acknowledging the thoughtful gift he gave you, and mentioning how much you enjoy spending time with him.

Something Homemade: If you’re comfortable with it, making something like a playlist of songs you think he’d enjoy or baking him a small treat could be personal but not too serious.

Conclusion

It’s great that you’re thinking about how to show your appreciation. Since you’re still in the early stages of getting to know each other, something small, useful, and in line with his interests would feel thoughtful without putting too much pressure on the situation. A gym accessory or an experience-based gift could strike a good balance between personal and low-key, and it shows you’ve been paying attention to his likes.