Enhancement suit:

Wondrous Item, Very rare 

This item looks like a harness reaching from your chest to the end of each of your arms and to both of your feet. It's made of thin, light mithral strips linked together with leather straps. When you put this suit on under your normal clothes the mithral adheres to your limbs and you immediately feel stronger and faster

For ten minutes a day, wearing this enhancement suit gives you the following benefits:

• Your dex and str scores increase +1.
• Your walking speed increases by 15.
• Your jump distance and height are doubled.

I forgot to mention that this idea is modeled after something from the Five Kingdoms series.

Quote from Roguish_Archer >>

Enhancement suit: Suit

Wondrous Item, Very rare Does it require Attunement for something this powerful?

This item looks like a harness reaching from your chest to the end of each of your arms and to both of your feet. It's made of thin, light mithral strips linked together with leather straps. When you put this suit on under your normal clothes the mithral adheres to your limbs and you immediately feel stronger and faster. (Missed that one.) So, if I “immediately feel stronger & faster,” does that mean my 10 minutes starts immediately?

For ten minutes a day, wearing this enhancement suit gives you the following benefits: Is that 10-minutes all at once, or can I use 30 seconds here, a minute and 6 seconds later, etc? And does it take a command word or anything?

• Your dex and str scores increase +1. To a maximum of?
• Your walking speed increases by 15.
• Your jump distance and height are doubled.

 Sorry, figured that salute be easier.

It doesn't require attunement, because the suit can only be used 10 minutes total per day, no matter who's using it. Hope that makes sense.

Thanks for your input. Here is the updated version.

Exosuit:

Wondrous Item, Very rare 

This item looks like a harness reaching from your chest to the end of each of your arms and to both of your feet. It's made of thin, light mithral strips linked together with leather straps. When you put this suit on under your normal clothes and armour the mithral adheres to your limbs and you immediately feel slightly stronger and faster.

While wearing the Exosuit you can speak its command word as a bonus action and gain the following benefits:

• Your dex and str scores increase by 2 to a maximum of 20 (this almost guarantees a modifier bonus, too powerful?)
• Your walking speed increases by 15.
• Your jump distance and height are doubled

When this suit has been used for a total of ten minutes it ceases to function until the next day

You might want to take some inspiration from how winged boots are written:

While you wear these boots, you have a flying speed equal to your walking speed. You can use the boots to fly for up to 4 hours, all at once or in several shorter flights, each one using a minimum of 1 minute from the duration. If you are flying when the duration expires, you descend at a rate of 30 feet per round until you land.

The boots regain 2 hours of flying capability for every 12 hours they aren't in use.