Q1: When I use this card's Delay effect to digivolve into a card in my hand, can it digivolve regardless of its digivolution requirements?
No, this card's Delay effect does not allow ignoring digivolution requirements, so you can only digivolve into a card that meets the digivolution requirements.
Q2: Can I use this card's Delay effect to burst digivolve or DNA digivolve into a card in my hand?
No, you can't burst digivolve or DNA digivolve.
Q3: Can I use this card's Delay effect to digivolve a Tamer into a Digimon card with a "your Tamer is treated as a Digimon and can digivolve" effect?
No, you can't. This card's Delay effect digivolves 1 Digimon. It doesn't digivolve Tamers.
Q4: Can I activate this card's Delay effect but choose to not digivolve?
Yes, you can.
Physical Training P-105 P [Main] Reveal the top 2 cards of your deck. Add 1 yellow card among them to the hand. Return the rest to the bottom of the deck in any order. Then, place this card in the battle area. [Main] <Delay> • 1 of your Digimon may digivolve into a yellow Digimon card in your hand for its digivolution cost. When it would digivolve by this effect, reduce the cost by 2. --- [Security] Place this card in the battle area.
Physical Training P-105 P [Main] Reveal the top 2 cards of your deck. Add 1 yellow card among them to the hand. Return the rest to the bottom of the deck in any order. Then, place this card in the battle area. [Main] <Delay> (After this card is placed, by trashing it the next turn or later, activate the effect below.) • 1 of your Digimon may digivolve into a yellow Digimon card in your hand for its digivolution cost. When it would digivolve by this effect, reduce the cost by 2. --- [Security] Place this card in the battle area.
Physical Training P-105 P [Main] Reveal the top 2 cards of your deck. Add 1 {{Colour|yellow}} card among them to your hand. Place the rest at the bottom of your deck in any order. Then, place this card into your battle area. [Main] <Delay> • 1 of your Digimon may digivolve into a {{Colour|yellow}} Digimon card in your hand for its digivolution cost. When it would digivolve by this effect, reduce the cost by 2. ---
フィジカル• トレーニング P-105 P 【メイン】自分のデッキの上から2枚オープンする。その中の黄のカード1枚を手札に加える。残りは好きな順番でデッキの下に戻す。その後、このカードをバトルエリアに置く。 【メイン】≪ディレイ≫(置いた次のターン以降にこのカードを破棄することで、効果を発揮する) • 自分のデジモン1体を手札の黄のデジモンカードに進化コストを支払って進化できる。この効果で進化するとき、支払う進化コスト-2。 --- 【セキュリティ】このカードをバトルエリアに置く。